# List of scheduled monuments in Monmouthshire

Monmouthshire has 200 scheduled monuments. The 46 prehistoric scheduled sites include burial sites, enclosures and 16 hill forts. Ten sites date from the Roman period, including four villas. There are four early Christian sites from early medieval times. The 101 sites from the medieval post-Norman period include castles and hidden castle mounds, remote dwellings, grand abbeys, holy wells, stones and churches. Finally the modern period has a 39 sites, including a very wide range of early industrial activities.
Scheduled monuments have statutory protection. The compilation of the list is undertaken by Cadw Welsh Historic Monuments, which is an executive agency of the Welsh Government. The list of scheduled monuments below is supplied by Cadw with additional material from RCAHMW and Glamorgan-Gwent Archaeological Trust.

## Scheduled monuments in Monmouthshire

| Name | Site type | Community | Location | Details | Historic County | Period | SAM No & Refs |
| Gray Hill Stone Circle | Stone circle | Caerwent | 51°38′16″N 2°48′49″W﻿ / ﻿51.6379°N 2.8136°W﻿ / 51.6379; -2.8136﻿ (Grey Hill Stone Circle), ST437935 | Fourteen visible stones, nine of which lie on their sides end to end, forming a circle. Possibly curb stones for a burial mound, or a stone circle. | Monmouthshire | Bronze Age | MM031 |
| Thornwell Farm burial mounds | Chambered long barrow | Chepstow | 51°37′17″N 2°40′02″W﻿ / ﻿51.6213°N 2.6673°W﻿ / 51.6213; -2.6673﻿ (Long Barrow and Round Barrow at Thornwell Farm), ST539916 | Two burial mounds now within a Chepstow housing estate. One may be a Neolithic long barrow, with stone chambers. The other is a Bronze Age round barrow. | Monmouthshire | Neolithic | MM206 |
| St Peter's Cave | Cave | Chepstow | 51°37′53″N 2°40′04″W﻿ / ﻿51.6313°N 2.6677°W﻿ / 51.6313; -2.6677﻿ (St Peter's Cave), ST538927 | A very wet cave under the cliffs of the Chepstow Bulwarks | Monmouthshire | Prehistoric | MM160 |
| Llangibby Bottom Standing Stone | Standing stone | Llangybi | 51°39′46″N 2°53′50″W﻿ / ﻿51.6628°N 2.8971°W﻿ / 51.6628; -2.8971﻿ (Llangibby Bottom Standing Stone), ST380963 | The 1.7 m high stone is in 'Priest's Meadow', and is claimed to be the spot where St Cybi pitched his tent when arriving in the 6th century. Also known as Waen-y-'Ffeirad. | Monmouthshire | Bronze Age | MM106 |
| Heston Brake Long Barrow | Long barrow | Portskewett | 51°35′41″N 2°42′55″W﻿ / ﻿51.5946°N 2.7154°W﻿ / 51.5946; -2.7154﻿ (Heston Brake Long Barrow), ST505886 | Evidence of a significant neolithic chambered tomb or long barrow. A small group of puddingstones mark the entrance of the site. Human skeletons, cattle bones and some pottery were discovered in the chamber when it was excavated in 1888. | Monmouthshire | Neolithic | MM018 |
| Llanfihangel Rogiet Standing Stone | Standing stone | Rogiet | 51°35′10″N 2°48′08″W﻿ / ﻿51.586°N 2.8022°W﻿ / 51.586; -2.8022﻿ (Llanfihangel Rogiet Standing Stone Lane), ST445877 | A triangular tapered standing stone, 2.4 m high, and 1.6 m by 0.5 m at the base. Also known as The Devil's Quoit.$^{:152}$ | Monmouthshire | Bronze Age? | MM068 |
| Gaerllwyd Burial Chamber | Chambered tomb | Shirenewton | 51°40′00″N 2°48′00″W﻿ / ﻿51.6667°N 2.8°W﻿ / 51.6667; -2.8﻿ (Gaerllwyd Burial Chamber), ST447967 | A portal dolmen with eleven conglomerate stones, some standing and some upright, supporting a large capstone. | Monmouthshire | Neolithic | MM013 |
| Harold's Stones | Stone alignment | Trellech United | 51°44′34″N 2°43′36″W﻿ / ﻿51.7427°N 2.7266°W﻿ / 51.7427; -2.7266﻿ (Harold's Stones, Trellech), SO499051 | Three large monoliths, made of puddingstone, aligned from northeast by east to southwest by west. Local legends say that the stones were thrown by Jack o' Kent from the summit of the Skirrid, over twelve miles away.$^{:45}$ | Monmouthshire | Bronze Age | MM017 |
| Crick Round Barrow | Round barrow | Caerwent | 51°36′32″N 2°44′45″W﻿ / ﻿51.6088°N 2.7459°W﻿ / 51.6088; -2.7459﻿ (Crick Round Barrow), ST484902 | A round barrow (41 m in diameter and 1.5 m high). Excavations in 1939 and 1979 found Bronze Age flint tools, funerary remains, and a stone kerb ring 29 m in diameter. Some of the cup stones may have been used for astronomical observations. | Monmouthshire | Bronze Age | MM151 |
| Foresters' Oaks round barrow | Round barrow | Caerwent | 51°38′34″N 2°49′31″W﻿ / ﻿51.6428°N 2.8254°W﻿ / 51.6428; -2.8254﻿ (Foresters' Oaks round barrow), ST429941 | A Bronze Age barrow approximately 16 m in diameter and 1 m high. | Monmouthshire | Bronze Age? | MM333 |
| Five Lanes Round Barrow | Round barrow | Caerwent | 51°36′52″N 2°47′41″W﻿ / ﻿51.6144°N 2.7946°W﻿ / 51.6144; -2.7946﻿ (Five Lanes Round Barrow), ST450909 | One of a pair of Bronze Age barrows (the other is not scheduled). The barrow is 35 m in diameter but was probably smaller (25 m). | Monmouthshire | Bronze Age | MM179 |
| Cwm Bwchel Round Cairn | Round cairn | Llanvihangel Crucorney | 51°56′20″N 3°03′17″W﻿ / ﻿51.9388°N 3.0548°W﻿ / 51.9388; -3.0548﻿ (Cwm Bwchel Round Cairn), SO275272 | | Monmouthshire | Prehistoric | MM343 |
| Garreg Las Round Cairns | Round cairn | Llanvihangel Crucorney | 51°55′30″N 3°00′23″W﻿ / ﻿51.9249°N 3.0063°W﻿ / 51.9249; -3.0063﻿ (Garreg Las Round Cairns), SO309256 | | Monmouthshire | Prehistoric | MM302 |
| Graig Ddu Round Cairn | Round cairn | Llanvihangel Crucorney | 51°56′19″N 3°03′17″W﻿ / ﻿51.9387°N 3.0548°W﻿ / 51.9387; -3.0548﻿ (Graig Ddu Round Cairn), SO284264 | | Monmouthshire | Prehistoric | MM342 |
| Hatterrall Hill Enclosure | Enclosure | Llanvihangel Crucorney | 51°55′27″N 3°00′30″W﻿ / ﻿51.9241°N 3.0083°W﻿ / 51.9241; -3.0083﻿ (Hatterrall Hill Enclosure), SO308255 | | Monmouthshire | Prehistoric | MM261 |
| Loxidge Tump cairn | Round cairn | Llanvihangel Crucorney | 51°57′25″N 3°02′11″W﻿ / ﻿51.9569°N 3.0363°W﻿ / 51.9569; -3.0363﻿ (Loxidge Tump cairn), SO288292 | | Monmouthshire | Prehistoric | MM304 |
| Rhiw Arw cairn | Round cairn | Llanvihangel Crucorney | 51°56′18″N 3°00′32″W﻿ / ﻿51.9383°N 3.0089°W﻿ / 51.9383; -3.0089﻿ (Rhiw Arw cairn), SO307271 | | Monmouthshire | Prehistoric | MM299 |
| Three Wells Round Cairn | Round cairn | Llanvihangel Crucorney | 51°54′29″N 2°59′47″W﻿ / ﻿51.908°N 2.9964°W﻿ / 51.908; -2.9964﻿ (Three Wells Round Cairn), SH315237 | | Monmouthshire | Prehistoric | MM303 |
| Chepstow Park Wood Cairn | Round cairn | Devauden | 51°40′28″N 2°44′15″W﻿ / ﻿51.6744°N 2.7376°W﻿ / 51.6744; -2.7376﻿ (Chepstow Park Wood Cairn), ST490975 | | Monmouthshire | Prehistoric | MM286 |
| Carn Blorenge | Round cairn | Llanfoist Fawr | 51°48′02″N 3°03′37″W﻿ / ﻿51.8006°N 3.0602°W﻿ / 51.8006; -3.0602﻿ (Carn Blorenge), SO269118 | | Monmouthshire | Bronze Age | MM219 |
| Carn-y-Defaid Round Cairns | Round cairn | Llanfoist Fawr, (also Blaenavon), (see also Torfaen) | 51°47′03″N 3°03′31″W﻿ / ﻿51.7842°N 3.0585°W﻿ / 51.7842; -3.0585﻿ (Carn-y-Defaid Round Cairns), SO270100 | | Monmouthshire | Prehistoric | MM209 |
| Middle Hendre Round Barrow | Round barrow | Llangattock-Vibon-Avel | 51°49′12″N 2°47′37″W﻿ / ﻿51.82°N 2.7936°W﻿ / 51.82; -2.7936﻿ (Middle Hendre Round Barrow), SO453137 | | Monmouthshire | Prehistoric | MM112 |
| Round Barrow 180 m North of Ty-Canol | Round barrow | Llanover | 51°46′01″N 2°56′30″W﻿ / ﻿51.767°N 2.9417°W﻿ / 51.767; -2.9417﻿ (Round Barrow 180 m North of Ty-Canol), SO351080 | | Monmouthshire | Prehistoric | MM081 |
| Wentwood Lodge Round Barrows | Round barrow | Shirenewton | 51°38′48″N 2°50′41″W﻿ / ﻿51.6467°N 2.8446°W﻿ / 51.6467; -2.8446﻿ (Wentwood Lodge Round Barrows), ST416945 | Two round barrows 180 m north-west of Wentwood Lodge. | Monmouthshire | Prehistoric | MM167 |
| Lower Hale Wood Round Barrows | Round cairn | Tintern | 51°42′20″N 2°41′42″W﻿ / ﻿51.7055°N 2.6951°W﻿ / 51.7055; -2.6951﻿ (Lower Hale Wood Round Barrows), SO520009 | Three Round Barrows in Lower Hale Wood. | Monmouthshire | Prehistoric | MM191 |
| Gwehelog Camp | Enclosure | Gwehelog Fawr | 51°43′04″N 2°52′27″W﻿ / ﻿51.7177°N 2.8743°W﻿ / 51.7177; -2.8743﻿ (Gwehelog Camp), SO397024 | Also known as Gwernydd camp. 650 m South of Ty Freeman. | Monmouthshire | Prehistoric | MM178 |
| Defended Enclosure 350 m NNW of Ty-Uchaf | Enclosure - Defensive | Llanelly | 51°49′51″N 3°07′34″W﻿ / ﻿51.8309°N 3.1262°W﻿ / 51.8309; -3.1262﻿ (Defended Enclosure 350 m NNW of Ty-Uchaf), SO224153 | | Brecknockshire | Prehistoric | BR405 |
| Buckholt Wood Hilltop Enclosure | Enclosure | Monmouth | 51°50′23″N 2°43′27″W﻿ / ﻿51.8397°N 2.7241°W﻿ / 51.8397; -2.7241﻿ (Buckholt Wood Hilltop Enclosure), SO502159 | | Monmouthshire | Prehistoric | MM258 |
| Sudbrook Camp and Sudbrook Chapel | Enclosure | Portskewett | 51°34′57″N 2°42′55″W﻿ / ﻿51.5826°N 2.7154°W﻿ / 51.5826; -2.7154﻿ (Sudbrook Camp and Sudbrook Chapel), ST505873 | | Monmouthshire | Prehistoric | MM048 |
| Bishop Barnet's Wood Camp | Enclosure | Mathern | 51°38′40″N 2°41′45″W﻿ / ﻿51.6445°N 2.6957°W﻿ / 51.6445; -2.6957﻿ (Bishop Barnet's Wood Camp), ST519941 | | Monmouthshire | Prehistoric | MM139 |
| Llanmelin Wood Hill Fort | Hill fort | Shirenewton | 51°37′45″N 2°46′46″W﻿ / ﻿51.6291°N 2.7794°W﻿ / 51.6291; -2.7794﻿ (Llanmelin Wood Camps), ST461925 | A roughly oval hilltop fort (140 m by 100 m), with an area of about 6.56 hectares. Originally univallate, but expansion in the 2nd century BC added further banks. Archaeological investigations have indicated occupation during Roman times and in the 12th and 13th centuries. | Monmouthshire | Iron Age | MM024 |
| The Larches Camp | Hill fort | Caerwent | 51°36′21″N 2°49′13″W﻿ / ﻿51.6058°N 2.8202°W﻿ / 51.6058; -2.8202﻿ (The Larches Camp), ST432899 | A roughly D-shaped hill top fort (140 m by 100 m), with an area of about 1.24 hectares. The north is protected by a steep slope, with a bank and ditch around the rest of the site. | Monmouthshire | Iron Age | MM069 |
| Chepstow Bulwarks Camp | Hill fort | Chepstow | 51°37′52″N 2°40′08″W﻿ / ﻿51.6312°N 2.6689°W﻿ / 51.6312; -2.6689﻿ (Bulwarks Camp), ST538927 | A small defensive hill fort, on top of cliffs overlooking the River Wye, the Beachley peninsula and the Severn estuary. It was probably built around the first century BC or the first century AD. | Monmouthshire | Iron Age | MM093 |
| Pen-Twyn Earthwork | Hill fort | Llanvihangel Crucorney | 51°54′04″N 2°59′15″W﻿ / ﻿51.9011°N 2.9874°W﻿ / 51.9011; -2.9874﻿ (Pen-Twyn Earthwork), SO321229 | A roughly rectangular hill top fort (140 m by 70 m), with an area of about 4.17 hectares. The fort is at the south end of Hatterall Hill with the ground sloping away to the east, south and west. The site is divided by a West-East bank and ditch. This may indicate the northern part is the oldest and extended later to include the southern part. Offa's Dyke Path passes through the site. | Monmouthshire | Iron Age | MM064 |
| Twyn-y-Gaer Camp | Hill fort | Llanvihangel Crucorney | 51°53′30″N 3°01′38″W﻿ / ﻿51.8916°N 3.0273°W﻿ / 51.8916; -3.0273﻿ (Twyn-y-Gaer Camp), SO294219 | An elongated oval summit hill fort (roughly 225 m by 85 m), with an area of about 2.97 hectares. The fort occupies the top of Gaer hill and is split into three enclosures. Excavations in the 1960s and 1970s discovered jewellery, tools, ovens, signs of metal working, and traces of timber housing. | Monmouthshire | Iron Age | MM148 |
| Llancayo Camp | Hill fort | Gwehelog Fawr | 51°43′46″N 2°54′07″W﻿ / ﻿51.7294°N 2.902°W﻿ / 51.7294; -2.902﻿ (Llancayo Camp), SO378038 | An oval univallate hill fort, of roughly 2.00 hectares at the northern edge of a ridge. The fort includes a complex entrance, possibly a causeway, at the south-east of the site. | Monmouthshire | Iron Age | MM078 |
| Coed y Bwnydd Camp | Hill fort | Llanarth | 51°45′23″N 2°55′13″W﻿ / ﻿51.7565°N 2.9203°W﻿ / 51.7565; -2.9203﻿ (Coed y Bwnydd Camp), SO365068 | A large multivallate fort at the southern tip of Clytha Hill. The oval fort measures about 170 m by 114 m with an area of 6.39 hectares. | Monmouthshire | Iron Age | MM075 |
| Gaer Fawr hill fort | Hill fort | Llangwm | 51°41′07″N 2°48′35″W﻿ / ﻿51.6853°N 2.8096°W﻿ / 51.6853; -2.8096﻿ (Gaer Fawr hillfort), ST441988 | A roughly oval multivallate hill fort on a spur with an area of 3.50 hectares. The hill fort is surrounded by steep slopes to the west, north, and east. The site is broken up by lanes and field boundaries. | Monmouthshire | Iron Age | MM062 |
| Great House Camp | Hill fort | Llangwm | 51°43′34″N 2°49′23″W﻿ / ﻿51.7261°N 2.8231°W﻿ / 51.7261; -2.8231﻿ (Great House Camp), SO432033 | A roughly circular multivallate hill fort sited on a natural terrace. The internal dimensions are 140 m by 150 m with an area of 2.37 hectares. | Monmouthshire | Iron Age? | MM105 |
| Cae Camp | Hill fort | Llanhennock | 51°38′23″N 2°55′40″W﻿ / ﻿51.6398°N 2.9278°W﻿ / 51.6398; -2.9278﻿ (Cae Camp), ST358938 | An oval bivallate fort situated on a ridge, roughly 92 m by 86 m with an area of 1.59 hectares. The sites contains a disused quarry from much later times. | Monmouthshire | Iron Age | MM079 |
| Candwr Camp | Hill fort | Llanhennock | 51°38′09″N 2°58′11″W﻿ / ﻿51.6357°N 2.9698°W﻿ / 51.6357; -2.9698﻿ (Candwr Camp), ST329934 | Also known as Caerau Hill fort. The univallate fort is roughly circular (100 m by 75 m), sited on a natural prominence, with an area of 0.70 hectares. | Monmouthshire | Iron Age | MM135 |
| Wilcrick Hill Camp | Hill fort | Magor with Undy, (also Bishton), (see also Newport) | 51°35′09″N 2°51′04″W﻿ / ﻿51.5859°N 2.8512°W﻿ / 51.5859; -2.8512﻿ (Wilcrick Hill Camp), ST411877 | A large, roughly oval (194 m by 134 m) multivallate hill fort with an area of 1.0 hectares. The fort is surrounded on all sides by steep slopes. | Monmouthshire | Iron Age | MM127 |
| Gaer Hill Camp, Penterry | Hill fort | St Arvans | 51°40′40″N 2°42′01″W﻿ / ﻿51.6779°N 2.7002°W﻿ / 51.6779; -2.7002﻿ (Gaer Hill Camp, Penterry), ST516979 | A hilltop fort with commanding views. The fort includes roughly rectangular inner area (46 m x 68 m), inside a larger, roughly circular enclosure (240 m x 254 m). | Monmouthshire | Iron Age | MM025 |
| Pierce Wood Camps | Hill fort | St Arvans | 51°39′37″N 2°40′20″W﻿ / ﻿51.6604°N 2.6721°W﻿ / 51.6604; -2.6721﻿ (Pierce Wood Camps), ST536959 | Two hill forts on a steeply sided promontory of the River Wye, to the east of Piercefield House. The smaller (westerly) univallate fort is roughly rectangular (98 m x 82 m), with an area of 0.20 hectares. The Wye Valley Walk passes through the site. The larger (easterly) univallate fort is also roughly rectangular (388 m x 110 m). | Monmouthshire | Iron Age | MM020 |
| Blackcliff Wood Camp | Hill fort | Tintern | 51°41′16″N 2°40′58″W﻿ / ﻿51.6878°N 2.6827°W﻿ / 51.6878; -2.6827﻿ (Blackcliff Wood Camp), ST529990 | A roughly oval fort (72 m x 46 m) with an area of 0.46 hectares. The Wye Valley Walk passes through the site. Also known as Porthcaseg Fort. | Monmouthshire | Iron Age | MM027 |
| Gaer hill fort, Trellech | Hill fort | Trellech United | 51°43′49″N 2°44′08″W﻿ / ﻿51.7303°N 2.7356°W﻿ / 51.7303; -2.7356﻿ (Gaer hillfort, Trellech Cross), SO492037 | A roughly circular (diameter 33 m) bivallate fort with an area of 3.50 hectares. | Monmouthshire | Iron Age | MM077 |
| Abergavenny Roman Fort | Fort | Abergavenny | 51°49′13″N 3°01′08″W﻿ / ﻿51.8204°N 3.019°W﻿ / 51.8204; -3.019﻿ (Abergavenny Roman Fort), SO298140 | | Monmouthshire | Roman | MM193 |
| Caerwent Roman Town (Venta Silurum) | House (domestic) | Caerwent | 51°36′45″N 2°46′06″W﻿ / ﻿51.6126°N 2.7683°W﻿ / 51.6126; -2.7683﻿ (Caerwent Roman City), ST469907 | Extensively excavated Roman town. Much of the excavated remains are now open to the public. | Monmouthshire | Roman | MM001 |
| Church Farm Romano-British settlement | Enclosure | Caldicot | 51°35′57″N 2°44′59″W﻿ / ﻿51.5993°N 2.7496°W﻿ / 51.5993; -2.7496﻿ (Church Farm Romano-British settlement), ST481892 | | Monmouthshire | Late Iron Age/Roman | MM334 |
| Stoop Hill Cropmark Enclosure | Enclosure | Caldicot | 51°34′58″N 2°44′50″W﻿ / ﻿51.5828°N 2.7472°W﻿ / 51.5828; -2.7472﻿ (Stoop Hill Cropmark Enclosure), ST483873 | Enclosure revealed by Aerial Photography. | Monmouthshire | Roman | MM169 |
| Portskewett Hill Roman Site | Unclassified site | Portskewett | 51°35′41″N 2°43′35″W﻿ / ﻿51.5946°N 2.7264°W﻿ / 51.5946; -2.7264﻿ (Portskewett Hill Roman Site), ST497886 | | Monmouthshire | Roman | MM019 |
| Usk Roman Site | Fort | Usk | 51°42′05″N 2°53′58″W﻿ / ﻿51.7014°N 2.8995°W﻿ / 51.7014; -2.8995﻿ (Usk Roman Site), SO379006 | The Roman legionary fortress of Burrium was founded on the site of Usk by the military commander Aulus Didius Gallus, around AD 55 | Monmouthshire | Roman | MM155 |
| Five Lanes Roman Site | Villa | Caerwent | 51°36′55″N 2°48′04″W﻿ / ﻿51.6153°N 2.8011°W﻿ / 51.6153; -2.8011﻿ (Five Lanes Roman Site), ST446910 | Remains of a Roman villa comprising a winged corridor with five rooms and other structures. Near to the Roman town at Caerwent. | Monmouthshire | Roman | MM350 |
| Whitewall Brake Roman Site | Villa | Caerwent | 51°37′00″N 2°45′33″W﻿ / ﻿51.6168°N 2.7592°W﻿ / 51.6168; -2.7592﻿ (Whitewall Brake Roman Site), ST475911 | Rectilinear complex of building ranges and courts, where a Roman mosaic, along with characteristic Roman building debris was discovered | Monmouthshire | Roman | MM152 |
| Little Hadnock Roman Villa, Dixton Newtown | Villa | Monmouth | 51°50′02″N 2°40′33″W﻿ / ﻿51.8338°N 2.6758°W﻿ / 51.8338; -2.6758﻿ (Little Hadnock Roman Villa, Dixton Newtown), SO535152 | Group of stone buildings, one with hypocaust. Finds indicate occupation in the 2nd-3rd century AD. | Monmouthshire | Roman | MM195 |
| Wyndcliff Roman Site | Villa | St Arvans | 51°40′30″N 2°41′04″W﻿ / ﻿51.6751°N 2.6844°W﻿ / 51.6751; -2.6844﻿ (Wyndcliff Roman Site), ST527975 | | Monmouthshire | Roman | MM351 |
| Hatterrall Hill Cross Ridge Dyke | Linear earthwork | Llanvihangel Crucorney | 51°55′13″N 3°00′52″W﻿ / ﻿51.9202°N 3.0144°W﻿ / 51.9202; -3.0144﻿ (Hatterrall Hill Cross Ridge Dyke), SO303251 | | Monmouthshire | Early Medieval | MM260 |
| Skirrid Fawr hill fort | Hill fort | Llantilio Pertholey | 51°51′28″N 2°58′23″W﻿ / ﻿51.8579°N 2.9731°W﻿ / 51.8579; -2.9731﻿ (Skirrid Fawr hillfort), SO330181 | An elongated roughly oval multivallate hill fort at the northern end of a mountain ridge. The area of the hill fort includes the foundations of St Michael's Chapel. | Monmouthshire | Iron Age | MM182 |
| St Michaels Chapel (remains) | Chapel | Llantilio Pertholey | 51°51′28″N 2°58′23″W﻿ / ﻿51.8579°N 2.9731°W﻿ / 51.8579; -2.9731﻿ (St Michael's Chapel (remains)), SO330181 | The foundations of a medieval chapel (4 m north-south by 7.5 m east-west) at the northern end of a mountain ridge. The chapel lies within the area of the Skirrid Fawr hill fort. | Monmouthshire | Early Medieval | MM182 |
| Croes Lwyd Farm Cross | Cross | Raglan | 51°45′30″N 2°52′12″W﻿ / ﻿51.7584°N 2.8699°W﻿ / 51.7584; -2.8699﻿ (Croes Lwyd Farm Cross), SO400069 | An octagonal cross shaft and head carved from a single block. Marked on a 14th-century map. | Monmouthshire | Early Medieval | MM156 |
| St Arvan's Church Cross-slab | Cross-marked stone | St Arvans | 51°39′55″N 2°42′01″W﻿ / ﻿51.6653°N 2.7004°W﻿ / 51.6653; -2.7004﻿ (St Arvan's Church Cross-slab), ST516965 | | Monmouthshire | Early Medieval | MM355 |
| Abergavenny Bridge | Bridge | Abergavenny | 51°49′10″N 3°01′45″W﻿ / ﻿51.8195°N 3.0292°W﻿ / 51.8195; -3.0292﻿ (Abergavenny Bridge), SO291139 | (also known as Tudor Bridge) | Monmouthshire | 15th & 19th Century | MM010 |
| Abergavenny Castle | Castle | Abergavenny | 51°49′11″N 3°01′03″W﻿ / ﻿51.8197°N 3.0174°W﻿ / 51.8197; -3.0174﻿ (Abergavenny Castle), SO299139 | Fortified site since prehistoric times. 11th century Norman motte, with major building during 13th and 14th centuries. The keep was rebuilt in the 19th century and now houses a museum. | Monmouthshire | Medieval | MM056 |
| St Mary's Priory | Priory | Abergavenny | 51°49′17″N 3°00′57″W﻿ / ﻿51.8213°N 3.0157°W﻿ / 51.8213; -3.0157﻿ (St Mary's Priory), SO300141 | Area of Conventual Buildings. | Monmouthshire | Medieval | MM183 |
| Crick Medieval House | House (domestic) | Caerwent | 51°36′32″N 2°44′15″W﻿ / ﻿51.6089°N 2.7376°W﻿ / 51.6089; -2.7376﻿ (Crick Medieval House), ST490902 | | Monmouthshire | Medieval | MM053 |
| Crick Moated Site | Moated Site | Caerwent | 51°36′34″N 2°44′16″W﻿ / ﻿51.6095°N 2.7378°W﻿ / 51.6095; -2.7378﻿ (Crick Moated Site), ST490903 | | Monmouthshire | Medieval | MM051 |
| Dinham Castle | Castle | Caerwent | 51°37′39″N 2°45′08″W﻿ / ﻿51.6274°N 2.7522°W﻿ / 51.6274; -2.7522﻿ (Dinham Castle), ST480923 | Slight and overgrown remains of a small castle.$^{:66}$ One of six castles around Wentwood Forest. | Monmouthshire | Medieval | MM153 |
| Llanvair Castle | Castle | Caerwent | 51°37′40″N 2°48′07″W﻿ / ﻿51.6278°N 2.802°W﻿ / 51.6278; -2.802﻿ (Llanvair Castle), ST445924 | Remains of a small courtyard castle.$^{:29}$ One of six castles around Wentwood Forest. | Monmouthshire | Medieval | MM047 |
| St. Brides Netherwent Deserted Village | Deserted Medieval Village | Caerwent | 51°36′06″N 2°49′39″W﻿ / ﻿51.6017°N 2.8276°W﻿ / 51.6017; -2.8276﻿ (St Brides Netherwent Deserted Village), ST427895 | By tradition founded by Brochwael, the son of Meurig of Gwent, in the 10th century | Monmouthshire | Medieval | MM154 |
| Caldicot Castle (unoccupied parts) | Castle | Caldicot | 51°35′36″N 2°44′36″W﻿ / ﻿51.5932°N 2.7432°W﻿ / 51.5932; -2.7432﻿ (Caldicot Castle (unoccupied parts)), ST486885 | An extensive stone medieval castle (probably built on the site of an older earthwork castle) dated from the 13th and 14th century with some changes in the 15th century, and substantially restored and rebuilt in the 19th century.$^{:15–18}$ | Monmouthshire | Medieval | MM050 |
| The Berries Mound & Bailey Castle | Motte & Bailey | Caldicot | 51°36′08″N 2°44′29″W﻿ / ﻿51.6022°N 2.7415°W﻿ / 51.6022; -2.7415﻿ (The Berries Mound & Bailey Castle), ST487895 | Also known as Ballan Moor and Mount Ballan. A small motte with a large D-shaped bailey, in a low-lying, marshy area.$^{:255}$ Probably built by the Ballon family in the late 11th century or early 12th century.$^{:55}$ | Monmouthshire | Medieval | MM026 |
| Chepstow Castle | Castle | Chepstow | 51°38′37″N 2°40′32″W﻿ / ﻿51.6437°N 2.6755°W﻿ / 51.6437; -2.6755﻿ (Chepstow Castle), ST533940 | The castle is the most southerly of the Welsh Marches castles, overlooking the River Wye. Constructed in the late 11th century with 12th- and 13th-century additions. | Monmouthshire | Medieval | MM003 |
| Chepstow Port Wall | Town defences | Chepstow | 51°38′25″N 2°40′34″W﻿ / ﻿51.6404°N 2.6762°W﻿ / 51.6404; -2.6762﻿ (Chepstow Town Wall and Gate), ST533937 | | Monmouthshire | Medieval | MM002 |
| St Martin's Cwmyoy, Churchyard Cross | Cross | Llanvihangel Crucorney | 51°54′15″N 3°01′13″W﻿ / ﻿51.9042°N 3.0202°W﻿ / 51.9042; -3.0202﻿ (Cwmyoy Churchyard Cross), SO299233 | | Monmouthshire | Medieval | MM142 |
| Llanthony Priory | Priory | Llanvihangel Crucorney | 51°56′41″N 3°02′11″W﻿ / ﻿51.9448°N 3.0364°W﻿ / 51.9448; -3.0364﻿ (Llanthony Priory), SO289278 | | Monmouthshire | Medieval | MM004 |
| Pen-y-Clawdd Castle Mound | Motte | Llanvihangel Crucorney | 51°52′31″N 3°00′13″W﻿ / ﻿51.8752°N 3.0037°W﻿ / 51.8752; -3.0037﻿ (Pen-y-Clawdd Castle Mound), SO310201 | A low circular ditched mound. | Monmouthshire | Medieval | MM145 |
| Penbidwal Moated Site | Moated Site | Llanvihangel Crucorney | 51°53′39″N 2°57′30″W﻿ / ﻿51.8942°N 2.9582°W﻿ / 51.8942; -2.9582﻿ (Penbidwal Moated Site), SO341221 | | Monmouthshire | Medieval | MM210 |
| Tre Fedw, Moat Mound and Bailey Castle | Motte & Bailey | Llanvihangel Crucorney | 51°53′26″N 2°58′27″W﻿ / ﻿51.8905°N 2.9743°W﻿ / 51.8905; -2.9743﻿ (Tre Fedw, Moat Mound and Bailey Castle), SO330217 | | Monmouthshire | Medieval | MM063 |
| Chepstow Park Wood Moated Site | Moated Site | Devauden | 51°40′42″N 2°44′20″W﻿ / ﻿51.6783°N 2.7388°W﻿ / 51.6783; -2.7388﻿ (Chepstow Park Wood Moated Site), ST490979 | | Monmouthshire | Medieval | MM103 |
| Cwrt y Gaer Ringwork | Ringwork | Devauden | 51°41′42″N 2°47′56″W﻿ / ﻿51.6949°N 2.799°W﻿ / 51.6949; -2.799﻿ (Cwrt y Gaer Ringwork), ST448998 | | Monmouthshire | Medieval | MM067 |
| Holy Cross Kilgwrrwg, Churchyard Cross | Cross | Devauden | 51°40′56″N 2°46′45″W﻿ / ﻿51.6822°N 2.7792°W﻿ / 51.6822; -2.7792﻿ (Kilgwrrwg Churchyard Cross), ST462984 | | Monmouthshire | Medieval | MM104 |
| St Thomas a Becket's Wolvesnewton, Churchyard Cross | Cross | Devauden | 51°41′38″N 2°47′27″W﻿ / ﻿51.6939°N 2.7909°W﻿ / 51.6939; -2.7909﻿ (St. Thomas a Becket's Churchyard Cross, Wolvesnewton), ST454997 | | Monmouthshire | Medieval | MM330 |
| Goytre Wood Castle Mound | Motte | Grosmont | 51°54′16″N 2°56′29″W﻿ / ﻿51.9045°N 2.9415°W﻿ / 51.9045; -2.9415﻿ (Goytre Wood Castle Mound), SO353233 | Also known as Gwern Castle. A small damaged motte, 20 m in diameter and 4 m high. Remnants of a rectangular stone building on summit.$^{:200}$ | Monmouthshire | Medieval | MM138 |
| Grosmont Castle | Castle | Grosmont | 51°54′55″N 2°51′57″W﻿ / ﻿51.9154°N 2.8657°W﻿ / 51.9154; -2.8657﻿ (Grosmont Castle), SO405244 | The present ruins date from three building phases in the 11th and 12th centuries. One of 'The Three Castles' in the Monnow valley. | Monmouthshire | Medieval | MM007 |
| St Nicholas' Grosmont, Churchyard Cross | Cross | Grosmont | 51°54′51″N 2°52′01″W﻿ / ﻿51.9143°N 2.8669°W﻿ / 51.9143; -2.8669﻿ (Grosmont Churchyard Cross), SO404243 | | Monmouthshire | Medieval | MM147 |
| St Cadoc's Llangattock Lingoed, Churchyard Cross | Cross | Grosmont | 51°52′31″N 2°55′43″W﻿ / ﻿51.8754°N 2.9287°W﻿ / 51.8754; -2.9287﻿ (St. Cadoc's Churchyard Cross, Llangattock Lingoed), SO361200 | | Monmouthshire | Medieval | MM319 |
| St James's Llanvetherine, Churchyard Cross | Cross | Grosmont | 51°50′59″N 2°55′28″W﻿ / ﻿51.8497°N 2.9244°W﻿ / 51.8497; -2.9244﻿ (St. James's Churchyard Cross, Llanvetherine), SO364171 | | Monmouthshire | Medieval | MM317 |
| St David's Trostre, Churchyard Cross | Cross | Gwehelog Fawr | 51°44′05″N 2°55′43″W﻿ / ﻿51.7347°N 2.9285°W﻿ / 51.7347; -2.9285﻿ (St. David's Churchyard Cross, Trostre), SO359044 | | Monmouthshire | Medieval | MM321 |
| St Aeddan's Bettws Newydd, Churchyard Cross | Cross | Llanarth | 51°44′52″N 2°55′30″W﻿ / ﻿51.7478°N 2.9251°W﻿ / 51.7478; -2.9251﻿ (Bettws Newydd Churchyard Cross-Base), SO362058 | | Monmouthshire | Medieval | MM122 |
| St Teilo's Llanarth, Churchyard Cross | Cross | Llanarth | 51°47′37″N 2°54′24″W﻿ / ﻿51.7937°N 2.9066°W﻿ / 51.7937; -2.9066﻿ (Llanarth Churchyard Cross-Base), SO375109 | | Monmouthshire | Medieval | MM116 |
| St Mabli's Llanvapley, Churchyard Cross | Cross | Llanarth | 51°49′18″N 2°55′12″W﻿ / ﻿51.8217°N 2.9201°W﻿ / 51.8217; -2.9201﻿ (St. Mabli's Churchyard Cross, Llanvapley), SO366140 | | Monmouthshire | Medieval | MM318 |
| St Peter's Bryngwyn, Churchyard Cross | Cross | Llanarth | 51°46′45″N 2°53′05″W﻿ / ﻿51.7792°N 2.8847°W﻿ / 51.7792; -2.8847﻿ (St. Peter's Churchyard Cross, Bryngwyn), SO390093 | | Monmouthshire | Medieval | MM323 |
| Twyn y Cregen Castle Mound | Motte | Llanarth | 51°46′55″N 2°55′31″W﻿ / ﻿51.782°N 2.9252°W﻿ / 51.782; -2.9252﻿ (Twyn y Cregen Castle Mound), SO362096 | A 5 m high mound 20 m in diameter, and no traces of a ditch. | Monmouthshire | Medieval | MM080 |
| Wern-y-Cwrt Castle Mound | Motte | Llanarth | 51°46′29″N 2°52′47″W﻿ / ﻿51.7746°N 2.8797°W﻿ / 51.7746; -2.8797﻿ (Wern-y-Cwrt Castle Mound), SO394088 | A steep-sided mound (26 m in diameter and 4.5 m high) with traces of a surrounding ditch. | Monmouthshire | Medieval | MM099 |
| Graig Foel medieval ringwork | Ringwork | Llanbadoc | 51°42′17″N 2°54′49″W﻿ / ﻿51.7046°N 2.9136°W﻿ / 51.7046; -2.9136﻿ (Graig Foel medieval ringwork), SO369010 | | Monmouthshire | Medieval | MM335 |
| Battle Tump | Mound | Llanelly | 51°50′03″N 3°05′39″W﻿ / ﻿51.8341°N 3.0941°W﻿ / 51.8341; -3.0941﻿ (Battle Tump), SO247156 | | Brecknockshire | Medieval | BR010 |
| St Peter's Llanwenarth, Churchyard Cross | Cross | Llanfoist Fawr | 51°49′38″N 3°03′09″W﻿ / ﻿51.8271°N 3.0524°W﻿ / 51.8271; -3.0524﻿ (Llanwenarth Churchyard Cross-Base), SO275147 | | Monmouthshire | Medieval | MM118 |
| St Faith's Llanfoist, Churchyard Cross | Cross | Llanfoist Fawr | 51°48′46″N 3°02′11″W﻿ / ﻿51.8129°N 3.0365°W﻿ / 51.8129; -3.0365﻿ (St Faith's Churchyard Cross, Llanfoist), SO288132 | | Monmouthshire | Medieval | MM306 |
| Skenfrith Deserted Medieval Settlement | Deserted Medieval Village | Llangattock-Vibon-Avel | 51°52′43″N 2°47′39″W﻿ / ﻿51.8785°N 2.7942°W﻿ / 51.8785; -2.7942﻿ (Skenfrith Deserted Medieval Settlement,), SO454202 | | Monmouthshire | Medieval | MM215 |
| Newcastle Castle | Motte & Bailey | Llangattock-Vibon-Avel | 51°51′05″N 2°48′14″W﻿ / ﻿51.8513°N 2.8038°W﻿ / 51.8513; -2.8038﻿ (Newcastle Castle), SO447172 | | Monmouthshire | Medieval | MM085 |
| Grace Dieu Abbey | Abbey | Llangattock-Vibon-Avel | 51°48′51″N 2°47′51″W﻿ / ﻿51.8142°N 2.7974°W﻿ / 51.8142; -2.7974﻿ (Site of Grace Dieu Abbey), SO451131 | | Monmouthshire | Medieval | MM158 |
| Skenfrith Castle | Castle | Llangattock-Vibon-Avel | 51°52′43″N 2°47′25″W﻿ / ﻿51.8786°N 2.7904°W﻿ / 51.8786; -2.7904﻿ (Skenfrith Castle), SO456203 | One of three castles brought under a single lordship in 1138, the present ruins date from the 12th century. $^{:46–47}$ One of 'The Three Castles' in the Monnow valley. | Monmouthshire | Medieval | MM088 |
| Llangwm Mound & Bailey Castle | Motte | Llangwm | 51°41′38″N 2°49′47″W﻿ / ﻿51.694°N 2.8297°W﻿ / 51.694; -2.8297﻿ (Llangwm Mound & Bailey Castle), ST427997 | A low oval (14 m-16 m) motte. | Monmouthshire | Medieval | MM061 |
| Rockfield Farm motte | Ringwork | Llangwm | 51°42′21″N 2°50′04″W﻿ / ﻿51.7057°N 2.8345°W﻿ / 51.7057; -2.8345﻿ (Rockfield Farm motte), SO424011 | Ringwork north-east of New House. | Monmouthshire | Medieval | MM074 |
| Ffynnon Cybi (St Cybi's Well) | Well | Llangybi | 51°39′55″N 2°54′21″W﻿ / ﻿51.6652°N 2.9058°W﻿ / 51.6652; -2.9058﻿ (Ffynnon Cybi (St Cybi's Well)), ST374966 | | Monmouthshire | Medieval | MM074 |
| Llangibby Castle (Castell Tregrug) | Castle | Llangybi | 51°40′18″N 2°55′16″W﻿ / ﻿51.6717°N 2.9211°W﻿ / 51.6717; -2.9211﻿ (Llangibby Castle (Castell Tregrug)), ST364973 | A roughly rectangular castle sited on the summit of a ridge. Probably built in the early 14th century. The castle is largely ruinous but parts of walls and towers remain. Replaced an earlier motte and bailey (Llangibby Castle Mound) 400 m to the east. | Monmouthshire | Medieval | MM109 |
| Llangibby Castle Mound | Motte | Llangybi | 51°40′17″N 2°54′47″W﻿ / ﻿51.6714°N 2.913°W﻿ / 51.6714; -2.913﻿ (Llangibby Castle Mound), ST369973 | Also known as Bowling Green. A large low flat-topped circular mound. The site was heavily landscaped in the 18th century. Generally supposed to pre-date the nearby Llangibby Castle, but may post-date the castle.$^{:237}$ | Monmouthshire | Medieval | MM110 |
| Castell Arnallt (Castle Arnold) | Motte | Llanover | 51°47′06″N 2°59′14″W﻿ / ﻿51.7849°N 2.9873°W﻿ / 51.7849; -2.9873﻿ (Castle Arnold), SO319100 | A fortified court house, or llys, of Seisyll ap Dyfnwal, lord of Over Gwent (Gwent Uwchcoed), before it was destroyed after Seisyll and some of his household were killed in 1175. Minor earthwork remains. | Monmouthshire | Medieval | MM086 |
| St Cadoc's Llangattock Nigh Usk, Churchyard Cross | Cross | Llanover | 51°46′54″N 2°58′20″W﻿ / ﻿51.7816°N 2.9722°W﻿ / 51.7816; -2.9722﻿ (Llangattock Nigh Usk Churchyard Cross), SO330096 | Parish is also known as Llangattock Juxta Usk. | Monmouthshire | Medieval | MM123 |
| St David's Llanddewi Rhydderch, Churchyard Cross | Cross | Llanover | 51°48′41″N 2°56′40″W﻿ / ﻿51.8114°N 2.9444°W﻿ / 51.8114; -2.9444﻿ (Llanthewy-Rhytherch Churchyard Cross-Base), SO349129 | | Monmouthshire | Medieval | MM117 |
| St Michael's Llanvihangel Nigh Usk, Churchyard Cross | Cross | Llanover | 51°46′40″N 2°56′57″W﻿ / ﻿51.7778°N 2.9491°W﻿ / 51.7778; -2.9491﻿ (Llanvihangel Nigh Usk Churchyard Cross), SO346092 | (also known as Llanfihangel Gobion) | Monmouthshire | Medieval | MM124 |
| St Mary's Yard Castle Mound | Motte | Llanover | 51°45′26″N 2°56′36″W﻿ / ﻿51.7573°N 2.9434°W﻿ / 51.7573; -2.9434﻿ (St Mary's Yard Castle Mound), SO349069 | A low D-shaped mound near the village of Llanfair Kilgeddin. | Monmouthshire | Medieval | MM082 |
| St Bartholomew's Llanover, Churchyard Cross | Cross | Llanover | 51°46′45″N 2°59′24″W﻿ / ﻿51.7791°N 2.9901°W﻿ / 51.7791; -2.9901﻿ (St. Bartholomew's Churchyard Cross, Llanover), SO317094 | | Monmouthshire | Medieval | MM307 |
| St Bridget's Llansantffraed, Churchyard Cross | Cross | Llanover | 51°47′06″N 2°55′59″W﻿ / ﻿51.7849°N 2.9331°W﻿ / 51.7849; -2.9331﻿ (St. Bridget's Churchyard Cross, Llansantffraed), SO357099 | | Monmouthshire | Medieval | MM312 |
| St Mary's Llanfair Cilgedyn, Churchyard Cross | Cross | Llanover | 51°46′22″N 2°56′06″W﻿ / ﻿51.7729°N 2.9351°W﻿ / 51.7729; -2.9351﻿ (St. Mary's Churchyard Cross, Llanfair Cilgedyn), SO355086 | | Monmouthshire | Medieval | MM326 |
| Hen Gwrt Moated Site | Moated Site | Llantilio Crossenny | 51°49′53″N 2°52′42″W﻿ / ﻿51.8315°N 2.8782°W﻿ / 51.8315; -2.8782﻿ (Hen Gwrt Moated Site), SO395151 | | Monmouthshire | Medieval | MM094 |
| Penrhos Mound & Bailey Castle | Motte & Bailey | Llantilio Crossenny | 51°48′53″N 2°51′29″W﻿ / ﻿51.8146°N 2.8581°W﻿ / 51.8146; -2.8581﻿ (Penrhos Mound & Bailey Castle), SO409132 | A ditched motte, about 30 m in diameter and 6.0 m high, standing towards the south of an irregular oval enclosure defined by a ditch. It is possibly the castle mentioned as being demolished c.1252. | Monmouthshire | Medieval | MM097 |
| White Castle | Castle | Llantilio Crossenny | 51°50′46″N 2°54′08″W﻿ / ﻿51.8461°N 2.9022°W﻿ / 51.8461; -2.9022﻿ (White Castle), SO379167 | Norman in origins, it was first known as Llantilio Castle, but called the White Castle (after its whitewashed walls) from the 13th century. One of 'The Three Castles' in the Monnow valley. | Monmouthshire | Medieval | MM006 |
| Coed-Cwnwr Moated Site | Moated Site | Llantrisant Fawr | 51°41′26″N 2°51′04″W﻿ / ﻿51.6905°N 2.8511°W﻿ / 51.6905; -2.8511﻿ (Coed-Cwnwr Moated Site), ST412994 | An earthwork comprising a ditch enclosing a roughly 30 m square area | Monmouthshire | Medieval | MM060 |
| Moated Site North West of Bertholey House (White Hall) | Moated Site | Llantrisant Fawr | 51°38′57″N 2°53′02″W﻿ / ﻿51.6493°N 2.8839°W﻿ / 51.6493; -2.8839﻿ (Moated Site North West of Bertholey House), ST389948 | | Monmouthshire | Medieval | MM040 |
| The Procurator's House | House (domestic) | Magor with Undy | 51°34′44″N 2°49′53″W﻿ / ﻿51.579°N 2.8314°W﻿ / 51.579; -2.8314﻿ (Medieval Building adjoining Magor Churchyard), ST424870 | Post Medieval building adjoining Magor Churchyard | Monmouthshire | Post Medieval | MM180 |
| Medieval Moated Site 400 m N of Undy Church | Moated Site | Magor with Undy | 51°34′56″N 2°48′36″W﻿ / ﻿51.5823°N 2.81°W﻿ / 51.5823; -2.81﻿ (Medieval Moated Site 400 m N of Undy Church), ST439873 | Courtfield is a domestic site comprising a central 'platform' measuring 60 m (NE-SW) by 45 m, embanked on the NE, surrounded by a ditch up to 1.2 m deep and an outer bank 0.5 m high; traces of bank and ditch projecting NW from the N corner are still visible. | Monmouthshire | Medieval | MM198 |
| Relict Seawall alongside Collister Pill Reen | Seawall | Magor with Undy | 51°34′33″N 2°48′04″W﻿ / ﻿51.5759°N 2.801°W﻿ / 51.5759; -2.801﻿ (Relict Seawall alongside Collister Pill Reen), ST445866 | 1.3 km stretch of embankment on the western side of Collister Pill Reen: thought to be an early feature in the landscape of the Caldicot levels | Monmouthshire | Medieval | MM226 |
| St Mary's Magor, Churchyard Cross | Cross | Magor with Undy | 51°34′45″N 2°49′50″W﻿ / ﻿51.5793°N 2.8306°W﻿ / 51.5793; -2.8306﻿ (St. Mary's Churchyard Crosses, Magor), ST425870 | | Monmouthshire | Medieval | MM314 |
| St Mary's Undy, Churchyard Cross | Cross | Magor with Undy | 51°34′42″N 2°48′35″W﻿ / ﻿51.5782°N 2.8096°W﻿ / 51.5782; -2.8096﻿ (Undy Churchyard Cross), ST439869 | | Monmouthshire | Medieval | MM126 |
| Moated Site South of Moynes Court | Moated Site | Mathern | 51°36′52″N 2°41′41″W﻿ / ﻿51.6144°N 2.6948°W﻿ / 51.6144; -2.6948﻿ (Moated Site South of Moynes Court), ST519908 | | Monmouthshire | Medieval | MM187 |
| Runston Chapel | Chapel | Mathern | 51°37′13″N 2°43′45″W﻿ / ﻿51.6204°N 2.7293°W﻿ / 51.6204; -2.7293﻿ (Runston Medieval Village Site & Runston Chapel), ST496915 | Runston Medieval Village Site & Runston Chapel | Monmouthshire | Medieval | MM095 |
| Dingestow Castle | Motte | Mitchel Troy | 51°47′24″N 2°47′25″W﻿ / ﻿51.79°N 2.7902°W﻿ / 51.79; -2.7902﻿ (Dingestow Castle), SO455104 | Two large roughly rectangular enclosures surrounded by ditches and the River Trothy. Constructed in 1184 but immediately raided. The shape and size are unusual for a motte and bailey in the region, and may have been the start of a masonry castle. Excavations in 1969 found no masonry remains. May have been abandoned, or built using wood pallisades, as the castle was noted in 1469. Possibly intended as a replacement for the nearby Mill Wood Castle Mound.$^{:26}$ | Monmouthshire | Medieval | MM113 |
| Mill Wood Castle Mound | Motte | Mitchel Troy | 51°47′22″N 2°47′05″W﻿ / ﻿51.7894°N 2.7846°W﻿ / 51.7894; -2.7846﻿ (Mill Wood Castle Mound), SO459103 | A ditched mound, roughly 32 m in diameter and 5 m high, with an enclosed bailey to the north. An early example of a motte and bailey. | Monmouthshire | Medieval | MM114 |
| St Michaels Mitchel Troy, Churchyard Cross | Cross | Mitchel Troy | 51°47′23″N 2°44′15″W﻿ / ﻿51.7898°N 2.7375°W﻿ / 51.7898; -2.7375﻿ (Mitchel Troy Churchyard Cross), SO492103 | 14th-century churchyard cross, 3.3 metres (11 ft) high, square sectioned with alternate ball flower and shield decorations, on a stepped base. | Monmouthshire | Medieval | MM111 |
| Moated Site at Coed-y-Fedw | Moated Site | Mitchel Troy | 51°46′30″N 2°48′16″W﻿ / ﻿51.7751°N 2.8044°W﻿ / 51.7751; -2.8044﻿ (Moated Site at Coed-y-Fedw), SO446088 | | Monmouthshire | Medieval | MM213 |
| St Catwg's Cwmcarfan, Churchyard Cross | Cross | Mitchel Troy | 51°45′49″N 2°45′31″W﻿ / ﻿51.7636°N 2.7587°W﻿ / 51.7636; -2.7587﻿ (St. Catwg's Churchyard Cross, Cwmcarfan), SO477074 | | Monmouthshire | Medieval | MM328 |
| St Dingad's Dingestow, Churchyard Cross | Cross | Mitchel Troy | 51°47′22″N 2°47′18″W﻿ / ﻿51.7895°N 2.7884°W﻿ / 51.7895; -2.7884﻿ (St. Dingad's Churchyard Cross, Dingestow), SO457103 | | Monmouthshire | Medieval | MM316 |
| St Mary's Tregaer, Churchyard Cross | Cross | Mitchel Troy | 51°47′16″N 2°50′44″W﻿ / ﻿51.7878°N 2.8455°W﻿ / 51.7878; -2.8455﻿ (St. Mary's Churchyard Cross, Tregaer), SO417102 | | Monmouthshire | Medieval | MM320 |
| Clawdd Du | Town defences | Monmouth | 51°48′23″N 2°43′19″W﻿ / ﻿51.8064°N 2.7219°W﻿ / 51.8064; -2.7219﻿ (Clawdd Du), SO503122 | A mediaeval linear defensive earthwork or moat, constructed as protection for the faubourg of Overmonnow, on the opposite side of the River Monnow from the town and castle of Monmouth. | Monmouthshire | Medieval | MM036 |
| Dixton Mound | Motte | Monmouth | 51°49′12″N 2°42′03″W﻿ / ﻿51.82°N 2.7008°W﻿ / 51.82; -2.7008﻿ (Dixton Mound), SO517137 | A low earth mound (30 m by 40 m and 2 m high) surrounded by a ditch. Excavations found pottery indicating occupation in Roman times and the 11th and 12th centuries. No evidence of a motte or bailey. Possibly a moated site.$^{:186}$ | Monmouthshire | Medieval | MM125 |
| Monmouth Castle | Castle | Monmouth | 51°48′45″N 2°43′00″W﻿ / ﻿51.8125°N 2.7167°W﻿ / 51.8125; -2.7167﻿ (Monmouth Castle), SO506128 | Built on the site of an early Norman border castle, the only parts now visible are parts of the Great Tower (11th - 12th century), Hall (13th century), and parts of walls. | Monmouthshire | Medieval | MM159 |
| Monnow Bridge | Bridge | Monmouth | 51°48′32″N 2°43′12″W﻿ / ﻿51.809°N 2.72°W﻿ / 51.809; -2.72﻿ (Monnow Bridge), SO504125 | Medieval bridge over the River Monnow | Monmouthshire | Medieval | MM008 |
| St Peter's Dixton, Churchyard Cross | Cross | Monmouth | 51°49′07″N 2°41′55″W﻿ / ﻿51.8186°N 2.6985°W﻿ / 51.8186; -2.6985﻿ (St. Peter's Churchyard Cross, Dixton), SO519135 | | Monmouthshire | Medieval | MM308 |
| Harold's House (site of) | House (domestic) | Portskewett | 51°35′21″N 2°43′31″W﻿ / ﻿51.5891°N 2.7253°W﻿ / 51.5891; -2.7253﻿ (Harold's House (site of)), ST498880 | An excavation was carried out for the TV programme Time Team, broadcast on 30 March 2008. The excavation revealed that a Norman fortified tower house had existed on the site, probably contemporaneous with the nearby church, and reached by a creek off the Severn | Monmouthshire | Medieval | MM029 |
| St Mary's Portskewett, Churchyard Cross | Cross | Portskewett | 51°35′24″N 2°43′28″W﻿ / ﻿51.5899°N 2.7245°W﻿ / 51.5899; -2.7245﻿ (St. Mary's Churchyard Cross, Portskewett), ST499881 | | Monmouthshire | Medieval | MM315 |
| Raglan Castle | Castle | Raglan | 51°46′13″N 2°50′59″W﻿ / ﻿51.7702°N 2.8498°W﻿ / 51.7702; -2.8498﻿ (Raglan Castle), SO417085 | An impressive late medieval (13th - 15th century) stone castle. | Monmouthshire | Medieval | MM005 |
| St Cadoc's Raglan, Churchyard Cross | Cross | Raglan | 51°45′53″N 2°51′05″W﻿ / ﻿51.7646°N 2.8514°W﻿ / 51.7646; -2.8514﻿ (Raglan Churchyard Cross), SO414077 | | Monmouthshire | Medieval | MM100 |
| St Govan's Llangovan, Churchyard Cross | Cross | Raglan | 51°44′43″N 2°47′18″W﻿ / ﻿51.7453°N 2.7882°W﻿ / 51.7453; -2.7882﻿ (St. Govan's Churchyard Cross, Llangovan), SO456054 | | Monmouthshire | Medieval | MM327 |
| St John's Llandenny, Churchyard Cross | Cross | Raglan | 51°43′51″N 2°50′54″W﻿ / ﻿51.7309°N 2.8482°W﻿ / 51.7309; -2.8482﻿ (St. John's Churchyard Cross, Llandenny), SO415039 | | Monmouthshire | Medieval | MM322 |
| St Martin's Pen-y-Clawdd, Churchyard Cross | Cross | Raglan | 51°46′00″N 2°47′39″W﻿ / ﻿51.7667°N 2.7943°W﻿ / 51.7667; -2.7943﻿ (St. Martin's Churchyard Cross, Pen-y-Clawdd), SO452078 | | Monmouthshire | Medieval | MM329 |
| Trecastle Motte and Bailey | Motte and Bailey | Raglan | 51°45′34″N 2°47′45″W﻿ / ﻿51.7594°N 2.7957°W﻿ / 51.7594; -2.7957﻿ (Trecastle Motte and Bailey), SO451070 | An oval motte with bailey to the south surrounded by a moat. | Monmouthshire | Medieval | MM098 |
| St Michael's Llanfihangel Rogiet, Churchyard Cross | Cross | Rogiet | 51°35′13″N 2°47′36″W﻿ / ﻿51.5869°N 2.7934°W﻿ / 51.5869; -2.7934﻿ (St. Michael's Churchyard Cross, Llanfihangel Rogiet), ST451878 | | Monmouthshire | Medieval | MM325 |
| Cas Troggy Castle | Castle | Shirenewton | 51°39′09″N 2°50′49″W﻿ / ﻿51.6526°N 2.8469°W﻿ / 51.6526; -2.8469﻿ (Cas Troggy Castle), ST415952 | Small ruined fortified hunting lodge or manor house built by Roger Bigod around 1303. One of six castles around Wentwood Forest. | Monmouthshire | Medieval | MM015 |
| St Mary's Penterry, Churchyard Cross | Cross | Tintern | 51°41′07″N 2°41′46″W﻿ / ﻿51.6854°N 2.6962°W﻿ / 51.6854; -2.6962﻿ (St. Mary's Churchyard Cross, Penterry), ST519987 | | Monmouthshire | Medieval | MM331 |
| Tintern Abbey Inner Precinct | Abbey | Tintern | 51°41′49″N 2°40′36″W﻿ / ﻿51.6969°N 2.6768°W﻿ / 51.6969; -2.6768﻿ (Tintern Abbey, Inner Precinct), SO533000 | | Monmouthshire | Medieval | MM102 |
| Tintern Abbey, Precinct Wall | Wall | Tintern | 51°41′50″N 2°40′49″W﻿ / ﻿51.6971°N 2.6802°W﻿ / 51.6971; -2.6802﻿ (Tintern Abbey, Precinct Wall), SO530000 | | Monmouthshire | Medieval | MM157 |
| Tintern Abbey, Watergate | Gatehouse | Tintern | 51°41′53″N 2°40′41″W﻿ / ﻿51.6981°N 2.678°W﻿ / 51.6981; -2.678﻿ (Tintern Abbey, Watergate), SO532001 | | Monmouthshire | Medieval | MM265 |
| Medieval House Sites W of Trellech Church | Shrunken Medieval Village | Trellech United | 51°44′46″N 2°43′34″W﻿ / ﻿51.746°N 2.7261°W﻿ / 51.746; -2.7261﻿ (Medieval House Sites W of Trellech Church), SO499055 | | Monmouthshire | Medieval | MM194 |
| St Mary's Penallt, Churchyard Cross | Cross | Trellech United | 51°47′35″N 2°41′40″W﻿ / ﻿51.7931°N 2.6944°W﻿ / 51.7931; -2.6944﻿ (Penallt Churchyard Cross), SO522107 | | Monmouthshire | Medieval | MM146 |
| The Virtuous Well | Holy Well | Trellech United | 51°44′33″N 2°43′16″W﻿ / ﻿51.7424°N 2.7212°W﻿ / 51.7424; -2.7212﻿ (The Virtuous Well), SO503051 | | Monmouthshire | Medieval | MM171 |
| St Nicholas' Trellech, Churchyard Cross | Cross | Trellech United | 51°44′44″N 2°43′30″W﻿ / ﻿51.7456°N 2.7249°W﻿ / 51.7456; -2.7249﻿ (Trellech Churchyard Cross), SO500054 | Five-stepped pedestal, large socketstone, with two sections of shaft and a modern cross-head, in St Nicholas' Churchyard, Trellech. | Monmouthshire | Medieval | MM107 |
| Trellech Cross Preaching Cross | Cross | Trellech United | 51°43′59″N 2°43′35″W﻿ / ﻿51.733°N 2.7263°W﻿ / 51.733; -2.7263﻿ (Trellech Cross), SO499040 | Wayside cross. Two stone steps on a roadside grassy bank. | Monmouthshire | Medieval | MM108 |
| Trellech Shrunken Medieval Village | Shrunken Medieval Village | Trellech United | 51°44′32″N 2°43′23″W﻿ / ﻿51.7422°N 2.723°W﻿ / 51.7422; -2.723﻿ (Trellech Shrunken Medieval Village), SO501050 | From 1250 to its decline around 1600, Trellech was a booming iron-melting centre. The scheduled area is close to the present village centre but an ongoing archaeological dig further south has found many building foundations. | Monmouthshire | Medieval | MM272 |
| Tump Terrett Castle Mound | Motte | Trellech United | 51°44′41″N 2°43′33″W﻿ / ﻿51.7447°N 2.7257°W﻿ / 51.7447; -2.7257﻿ (Tump Terrett Castle Mound), SO499053 | A steep-sided ditched mound (36 m in diameter and 5.5 m high). Mentioned in 1231 and later referred to as "site of" in 1306. Recent excavations and investigation suggest a Motte and Bailey castle, built early in the period of the Norman conquest of the area.$^{:332}$ | Monmouthshire | Medieval | MM016 |
| Usk Castle (Unoccupied parts) | Castle | Usk | 51°42′19″N 2°54′12″W﻿ / ﻿51.7052°N 2.9033°W﻿ / 51.7052; -2.9033﻿ (Usk Castle (Unoccupied Parts)), SO376011 | A substantial masonry castle dating from around 1138 and now generally ruinous. | Monmouthshire | Medieval | MM012 |
| Usk Priory Gatehouse | Gatehouse | Usk | 51°42′09″N 2°54′03″W﻿ / ﻿51.7024°N 2.9009°W﻿ / 51.7024; -2.9009﻿ (Usk Priory Gatehouse), SO378007 | A surviving fragment of a Benedictine priory founded around 1135 and dissolved in 1536 | Monmouthshire | Medieval | MM090 |
| Chepstow Town Slipway | Quay | Chepstow | 51°38′40″N 2°40′07″W﻿ / ﻿51.6445°N 2.6686°W﻿ / 51.6445; -2.6686﻿ (Chepstow Town Slipway), ST538941 | A well preserved post-medieval slip compromising of a cambered cobbled slipway some 25 m long by 2.6 m wide, sloping at an angle of 10 degrees. The final 5.0 m of the slipway forms a flight of shallow steps down to the low-tide mark in the River Wye | Monmouthshire | Post Medieval | MM301 |
| Hygga Farm Dovecote | Dovecote | Trellech United | 51°43′45″N 2°44′46″W﻿ / ﻿51.7292°N 2.7462°W﻿ / 51.7292; -2.7462﻿ (Hygga Farm Dovecote), SO485036 | A circular stone dovecote with mullion windows and a conical roof. | Monmouthshire | Post Medieval | MM150 |
| Disgwylfa Tramroads | Tramroad | Llanelly, (also Llangattock), (see also Powys) | 51°49′08″N 3°08′14″W﻿ / ﻿51.8189°N 3.1371°W﻿ / 51.8189; -3.1371﻿ (Disgwylfa Tramroads), SO217139 | | Brecknockshire | Post Medieval | MM340 |
| Lower or Abbey Wireworks, Tintern | Iron forge | Tintern | 51°41′52″N 2°41′11″W﻿ / ﻿51.6977°N 2.6864°W﻿ / 51.6977; -2.6864﻿ (Lower or Abbey Wireworks, Tintern), SO526001 | Early industrial site, manufacturing wire from the 16th to the 19th centuries. It was part of an integrated iron production system, sited along the Angidy Valley. The manufacture of wire was the final stage in the process, closest to the River Wye, at the foot of the valley. | Monmouthshire | Post Medieval | MM266 |
| Tintern Upper Wireworks (New Tongs Mill) | Leat | Tintern | 51°41′59″N 2°42′44″W﻿ / ﻿51.6997°N 2.7123°W﻿ / 51.6997; -2.7123﻿ (Tintern Upper Wireworks (New Tongs Mill)), SO508003 | | Monmouthshire | Post Medieval | MM268 |
| Whitebrook Wireworks Leat | Leat | Trellech United | 51°45′24″N 2°41′00″W﻿ / ﻿51.7567°N 2.6833°W﻿ / 51.7567; -2.6833﻿ (Whitebrook Wireworks Leat), SO529066 | | Monmouthshire | Post Medieval | MM292 |
| Cewere Quarry and Limekiln, Llanvair-Discoed | Quarry | Caerwent | 51°37′44″N 2°47′15″W﻿ / ﻿51.629°N 2.7874°W﻿ / 51.629; -2.7874﻿ (Cewere Quarry and Limekiln, Llanvair-Discoed), ST455925 | A well-preserved limekiln and quarry with associated earthworks. The kiln is of a Wye Valley type, roughly 4 m high and 6.5 m long, built into the bank to the south of the quarry. | Monmouthshire | 19th Century | MM289 |
| Limekiln and Quarries at Craig-yr-Hafod | Limekiln | Llanfoist Fawr | 51°47′14″N 3°03′21″W﻿ / ﻿51.7871°N 3.0558°W﻿ / 51.7871; -3.0558﻿ (Limekiln and Quarries at Craig-yr-Hafod), SO272103 | | Monmouthshire | Post Medieval | MM278 |
| Pwll Du Limestone Quarry & Water Balance Lift | Industrial monument | Llanfoist Fawr | 51°47′51″N 3°05′12″W﻿ / ﻿51.7974°N 3.0866°W﻿ / 51.7974; -3.0866﻿ (Pwll Du Limestone Quarry & Water Balance Lift), SO251115 | | Monmouthshire | Post Medieval | MM225 |
| Colwell Grove Limekiln and Quarry, Tintern | Limekiln | Tintern | 51°41′40″N 2°40′36″W﻿ / ﻿51.6945°N 2.6768°W﻿ / 51.6945; -2.6768﻿ (Colwell Grove Limekiln and Quarry, Tintern), ST533997 | | Monmouthshire | Post Medieval | MM290 |
| Clearwater Paper Mill | Mill | Trellech United | 51°45′27″N 2°40′49″W﻿ / ﻿51.7575°N 2.6804°W﻿ / 51.7575; -2.6804﻿ (Clearwater Paper Mill), SO531067 | | Monmouthshire | Post Medieval | MM294 |
| Whitebrook Wireworks | Iron forge | Trellech United | 51°45′16″N 2°40′50″W﻿ / ﻿51.7545°N 2.6805°W﻿ / 51.7545; -2.6805﻿ (Whitework Wireworks), SO531064 | | Monmouthshire | Post Medieval | MM270 |
| Tramway Embankment of Grosmont Railway | Tramway embankment | Llanvihangel Crucorney | 51°53′06″N 2°58′13″W﻿ / ﻿51.885°N 2.9704°W﻿ / 51.885; -2.9704﻿ (Tramway Embankment of Grosmont Railway), SO333211 | | Monmouthshire | Post Medieval | MM199 |
| Blorenge Quarries Tramroad | Tramroad | Llanfoist Fawr | 51°48′02″N 3°04′13″W﻿ / ﻿51.8006°N 3.0703°W﻿ / 51.8006; -3.0703﻿ (Blorenge Quarries Tramroad), SO262118 | | Monmouthshire | Post Medieval | MM288 |
| Blorenge Tunnel, Hill's Tramroad | Tramroad | Llanfoist Fawr | 51°48′35″N 3°03′30″W﻿ / ﻿51.8098°N 3.0583°W﻿ / 51.8098; -3.0583﻿ (Blorenge Tunnel, Hill's Tramroad), SO271128 | Tunnel, length approximately 40 m, carrying Hill's Tramroad. On the north slope of the Blorenge. | Monmouthshire | Post Medieval | MM275 |
| Hill's Tramroad Inclines, Llanfoist | Tramroad | Llanfoist Fawr | 51°48′31″N 3°02′52″W﻿ / ﻿51.8085°N 3.0478°W﻿ / 51.8085; -3.0478﻿ (Hill's Tramroad Inclines, Llanfoist), SO278127 | | Monmouthshire | 19th Century | MM276 |
| Pen-ffordd-goch Iron and coal patching, Blaenavon | Industrial monument | Llanfoist Fawr, (also Blaenavon), (see also Torfaen) | 51°47′18″N 3°04′38″W﻿ / ﻿51.7882°N 3.0773°W﻿ / 51.7882; -3.0773﻿ (Pen-ffordd-goch Iron and coal patching, Blaenavon), SO257104 | Pen-ffordd-goch is also known as The Keepers. The site is connected with the Hanbury estate from the 17th century and Blaenavon Ironworks from about 1788. The remains of scouring and adit mining include leats, ponds, dams, scours, levels, tips, shaft mounds, tracks and tramroads. | Monmouthshire | 17th Century | MM227 |
| Carreg Maen Taro Ironstone Quarries | Quarry | Llanfoist Fawr, (also Blaenavon), (also Llanelly), (see also Torfaen) | 51°47′38″N 3°06′20″W﻿ / ﻿51.794°N 3.1056°W﻿ / 51.794; -3.1056﻿ (Carreg Maen Taro Ironstone Quarries), SO238111 | | Monmouthshire | Post Medieval | MM295 |
| Pwll Du Tramroad Tunnel Northern Entrances & Site of Lower Bank | Industrial monument | Llanfoist Fawr | 51°47′55″N 3°05′45″W﻿ / ﻿51.7987°N 3.0957°W﻿ / 51.7987; -3.0957﻿ (Pwll Du Tramroad Tunnel Northern Entrances & Site of Lower Rank), SO245116 | Tunnel ran from near Blaenafon Iron works to link with the tramroad to the Brecon and Newport Canal at Llanfoist | Monmouthshire | 19th Century | MM224 |
| Tramroad Bridge, Bailey's Tramroad, Govilon | Bridge | Llanfoist Fawr | 51°48′50″N 3°04′31″W﻿ / ﻿51.8138°N 3.0754°W﻿ / 51.8138; -3.0754﻿ (Tramroad Bridge, Bailey's Tramroad, Govilon), SO259133 | Also known as Cwm Llanwenarth bridge | Monmouthshire | 19th Century | MM204 |
| Perth-hir House (Remains of) | House (domestic) | Llangattock-Vibon-Avel | 51°50′23″N 2°44′47″W﻿ / ﻿51.8396°N 2.7463°W﻿ / 51.8396; -2.7463﻿ (Perth-Hir House (Remains of)), SO486159 | | Monmouthshire | Post Medieval | MM144 |
| Blackcliff Wood Limekiln | Limekiln | Tintern | 51°40′49″N 2°40′37″W﻿ / ﻿51.6803°N 2.6769°W﻿ / 51.6803; -2.6769﻿ (Blackcliff Wood Limekiln), ST532981 | | Monmouthshire | Post Medieval | MM291 |
| Abbey Tintern Furnace | Industrial monument | Tintern | 51°41′57″N 2°42′18″W﻿ / ﻿51.6992°N 2.705°W﻿ / 51.6992; -2.705﻿ (Abbey Tintern Furnace), SO513002 | Angidy Ironworks. Also known as 'The Old Blast Furnace', it smelted Iron from the 1590s to the 1820s. It was a key part of the industrial metalworking of the Angidy Valley, producing iron for the wireworks further down the valley. | Monmouthshire | Post Medieval | MM197 |
| Coed-Ithel Iron Furnace | Kiln | Trellech United | 51°43′12″N 2°41′05″W﻿ / ﻿51.7199°N 2.6847°W﻿ / 51.7199; -2.6847﻿ (Coed-Ithel Iron Furnace), SO527025 | Early iron furnace. | Monmouthshire | Post Medieval | MM164 |
| Woolpitch Wood Iron Furnace | Kiln | Trellech United | 51°44′25″N 2°44′21″W﻿ / ﻿51.7402°N 2.7392°W﻿ / 51.7402; -2.7392﻿ (Woolpitch Wood Iron Furnace), SO490048 | Early iron furnace. | Monmouthshire | Post Medieval | MM177 |
| Clydach Ironworks (remains) and Smart's Bridge | Industrial monument | Llanelly | 51°48′45″N 3°07′11″W﻿ / ﻿51.8126°N 3.1196°W﻿ / 51.8126; -3.1196﻿ (Clydach Ironworks (remains) and Smart's Bridge), SO229132 | | Brecknockshire | 18th Century (Ironworks) and 19th Century (Bridge) | BR161 |
| Gilwern Embankment | Industrial monument | Llanelly | 51°49′25″N 3°05′54″W﻿ / ﻿51.8237°N 3.0982°W﻿ / 51.8237; -3.0982﻿ (Gilwern Embankment), SO244144 | | Monmouthshire | 18th Century | MM251 |
| Iron Furnace SW of Clydach | Industrial monument | Llanelly | 51°49′04″N 3°06′53″W﻿ / ﻿51.8179°N 3.1148°W﻿ / 51.8179; -3.1148﻿ (Iron Furnace SW of Clydach), SO232138 | Llanelly Furnace. | Brecknockshire | 17th Century | BR160 |
| Garnddyrys Ironworks (Site of) and adjacent Tramway | Industrial monument | Llanfoist Fawr | 51°48′00″N 3°04′39″W﻿ / ﻿51.7999°N 3.0774°W﻿ / 51.7999; -3.0774﻿ (Garnddyrys Ironworks (Site of) and adjacent Tramway), SO258118 | | Monmouthshire | Post Medieval | MM189 |
| The Graig Settlement | Settlement | Llanfoist Fawr | 51°50′27″N 3°04′51″W﻿ / ﻿51.8409°N 3.0808°W﻿ / 51.8409; -3.0808﻿ (The Graig Settlement), SO256163 | | Monmouthshire | Post Medieval | MM273 |
| Redbrook Incline Bridge | Bridge | Monmouth | 51°47′21″N 2°40′24″W﻿ / ﻿51.7892°N 2.6733°W﻿ / 51.7892; -2.6733﻿ (Redbrook Incline Overbridge), SO536102 | Carried Redbrook tin plate tramway until closure in 1872 | Monmouthshire | Post Medieval | MM203 |
| Royal Navy Propellant Factory, Caerwent, Nitro-glycerine Hill | Industrial building | Caerwent | 51°37′22″N 2°44′55″W﻿ / ﻿51.6228°N 2.7487°W﻿ / 51.6228; -2.7487﻿ (Royal Naval Propellant Factory Caerwent Nitro-glycerine Hill), ST482918 | An extensive site chosen for development for propellant manufacture due to natural slope and availability of water. | Monmouthshire | 20th Century | MM352 |
| Royal Navy Propellant Factory, Caerwent Guided Weapons Scheme Static Firing Bay | Royal Naval Depot | Caerwent | 51°37′31″N 2°45′20″W﻿ / ﻿51.6253°N 2.7555°W﻿ / 51.6253; -2.7555﻿ (Royal Naval Propellant Factory Guided Weapons Scheme Static Firing Bay), ST478921 | Built in 1959 to research and test the rocket booster engines for the Royal Navy's Sea Slug surface-to-air missiles | Monmouthshire | 20th Century | MM341 |
| Dyne Steel Incline | Incline | Llanfoist Fawr, (also Blaenavon), (see also Torfaen) | 51°47′36″N 3°06′06″W﻿ / ﻿51.7933°N 3.1017°W﻿ / 51.7933; -3.1017﻿ (Dyne Steel Incline), SO241110 | | Monmouthshire | Post Medieval | MM280 |
| The Alcove, Piercefield | Folly | St Arvans | 51°38′59″N 2°40′52″W﻿ / ﻿51.6496°N 2.6811°W﻿ / 51.6496; -2.6811﻿ (The Alcove, Piercefield), ST529947 | Semi-octagonal platform with a semi-circular stone seat with views of the Wye Valley and cliffs below Chepstow castle. The first of the viewpoints constructed in around 1850, for the Piercefield walk. Originally roofed with an arch. | Monmouthshire | 18th Century | MM285 |
| The Cold Bath, Piercefield | Bath-house | St Arvans | 51°40′05″N 2°41′18″W﻿ / ﻿51.6681°N 2.6884°W﻿ / 51.6681; -2.6884﻿ (The Cold Bath: Piercefield), ST524968 | Remains of a small rectangular brick and stone building which housed a tile-lined plunge pool. | Monmouthshire | 18th Century | MM281 |
| The Giant's Cave, Piercefield | Cave | St Arvans | 51°39′48″N 2°41′20″W﻿ / ﻿51.6633°N 2.6888°W﻿ / 51.6633; -2.6888﻿ (The Giant's Cave, Piercefield), ST524962 | Curved tunnel cut into the rockface. One of the features of the Piercefield Walk. | Monmouthshire | 18th Century | MM282 |
| The Grotto, Piercefield | Grotto | St Arvans | 51°39′30″N 2°40′36″W﻿ / ﻿51.6584°N 2.6766°W﻿ / 51.6584; -2.6766﻿ (The Grotto, Piercefield), ST532957 | A small domed alcove made of brick and built to provide a shaded seat with views across the Wye Valley, and originally lined with iron cinders, copper and quartz. One of the features on the Piercefield Walk. | Monmouthshire | 18th Century | MM283 |
| The Platform, Piercefield | Folly | St Arvans | 51°39′18″N 2°40′36″W﻿ / ﻿51.655°N 2.6767°W﻿ / 51.655; -2.6767﻿ (The Platform, Piercefield), ST532953 | | Monmouthshire | 18th Century | MM284 |
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