# List of Roman-to-modern scheduled monuments in Gwynedd

Gwynedd is a large rural county in North Wales. The northern half includes the high mountains of Snowdonia and the mixed farmland and hills of the Lleyn peninsula, which between them make up the former county of Caernarvonshire. The southern part of Gwynedd is the softer coastal and upland landscapes of the former county of Merionethshire. Gwynedd, the second largest county in Wales, has a total of 497 Scheduled monuments. That is too many to have on a single list article, so for convenience the list is divided into three. The 365 prehistoric sites are in two lists, covering 171 sites in former Merionethshire, and 194 sites in former Caernarvonshire. Below are the 132 sites dating from Roman to modern times, from the whole of Gwynedd. Gwynedd is a unitary authority comprising most of two historic counties. In 1974 it also merged with Anglesey, and the merged county was also called Gwynedd. Since 1996 Anglesey has been a separate county again.
There are 16 Roman scheduled sites on the list, almost all of which relate either to Roman military activity, or local defensive measures. By contrast, the 14 early medieval (Dark Age) monuments are all individual stones, either with carved crosses or other inscriptions or in one case a sundial. The 53 post-Norman medieval sites include sites included in the Castles and Town Walls of King Edward in Gwynedd World Heritage Site. Seven castles, 11 mottes, and seven enclosures are scheduled, as well as deserted settlements, two abbeys, five chapels and two holy wells. The 49 post-medieval sites include ten bridges, various sites relating to quarries, mines, engine houses, and railways, and five World War II defences.
The northern prehistoric sites are listed at List of prehistoric scheduled monuments in Gwynedd (former Caernarvonshire)
The southern prehistoric sites are listed at List of prehistoric scheduled monuments in Gwynedd (former Merionethshire)
Scheduled monuments have statutory protection. It is illegal to disturb the ground surface or any standing remains. The compilation of the list is undertaken by Cadw Welsh Historic Monuments, which is an executive agency of the National Assembly of Wales. The list of scheduled monuments below is supplied by Cadw with additional material from RCAHMW and Gwynedd Archaeological Trust.

## Roman to modern scheduled monuments in Gwynedd

| Name | Site type | Community | Location | Details | Historic County | Period | SAM No & Refs |
| Enclosure & Settlement 400m East of Cyfannedd Fawr | Hut circle settlement | Arthog | 52°41′25″N 4°01′20″W﻿ / ﻿52.6904°N 4.0223°W﻿ / 52.6904; -4.0223﻿ (Enclosure & Settlement 400m East of Cyfannedd Fawr), SH634122 | | Merionethshire | 2Roman | ME086 |
| Round Hut and Cairns on NW Slope of Braich Ddu | Ring cairn | Arthog | 52°41′23″N 4°01′15″W﻿ / ﻿52.6896°N 4.0208°W﻿ / 52.6896; -4.0208﻿ (Round Hut and Cairns on NW Slope of Braich Ddu), SH635121 | | Merionethshire | 2Roman | ME100 |
| Pier Camp | Earthwork | Bangor | 53°14′02″N 4°07′39″W﻿ / ﻿53.2339°N 4.1276°W﻿ / 53.2339; -4.1276﻿ (Pier Camp), SH581729 | Strongly defensible earthworth hillfort. A 4th century Roman coin found on the site. | Caernarvonshire | 2Unknown | CN073 |
| Dinas Emrys Camp | Hillfort | Beddgelert | 53°01′20″N 4°04′44″W﻿ / ﻿53.0222°N 4.0788°W﻿ / 53.0222; -4.0788﻿ (Dinas Emrys Camp), SH606492 | Hilltop fort which tradition links with Vortigern and Merlin. Iron Age, Roman and Dark Age evidence has all been found. Present stonework probably, medieval. | Caernarvonshire | 2Roman | CN018 |
| Brithdir Roman Fort | Roman fort | Brithdir and Llanfachreth | 52°45′13″N 3°49′15″W﻿ / ﻿52.7535°N 3.8209°W﻿ / 52.7535; -3.8209﻿ (Brithdir Roman Fort), SH772188 | Roman fortlet which may also have had its own settlement. Now on the edge of the village if Brithdir. | Merionethshire | 2Roman | ME080 |
| Segontium Roman Fort | Roman fort | Caernarfon | 53°08′14″N 4°15′58″W﻿ / ﻿53.1372°N 4.2662°W﻿ / 53.1372; -4.2662﻿ (Segontium Roman Site), SH485624 | Regiment garrisoned here from 77AD to 394AD, a uniquely long occupation within Wales. It was the administrative centre for NW Wales throughout this period. Excavated buildings on view. | Caernarvonshire | 2Roman | CN006 |
| Lower Roman Fort | Roman fort | Caernarfon | 53°08′12″N 4°16′13″W﻿ / ﻿53.1367°N 4.2702°W﻿ / 53.1367; -4.2702﻿ (Lower Roman Fort), SH482623 | | Caernarvonshire | 2Roman | CN094 |
| Bryn-Glas Roman Signal Station | Signal station | Caernarfon | 53°08′50″N 4°14′24″W﻿ / ﻿53.1473°N 4.2401°W﻿ / 53.1473; -4.2401﻿ (Bryn-Glas Roman Signal Station), SH502634 | | Caernarvonshire | 2Roman | CN188 |
| Llanfor Roman Fort and Camps | Roman fort | Llandderfel | 52°54′45″N 3°34′55″W﻿ / ﻿52.9124°N 3.582°W﻿ / 52.9124; -3.582﻿ (Llanfor Roman Fort and Camps (revealed by Aerial Photography)), SH937361 | (revealed by Aerial Photography) | Merionethshire | 2Roman | ME092 |
| Caer Gai Roman Site | Roman fort | Llanuwchllyn | 52°52′08″N 3°40′07″W﻿ / ﻿52.8688°N 3.6686°W﻿ / 52.8688; -3.6686﻿ (Caer Gai Roman Site), SH877314 | | Merionethshire | 2Roman | ME018 |
| Dinas y Prif Camp | Enclosure | Llanwnda | 53°05′42″N 4°17′46″W﻿ / ﻿53.0949°N 4.2961°W﻿ / 53.0949; -4.2961﻿ (Dinas y Prif Camp), SH463577 | | Caernarvonshire | 2Roman | CN030 |
| Castell Tomen y Mur | Amphitheatre | Maentwrog | 52°55′48″N 3°55′30″W﻿ / ﻿52.9299°N 3.925°W﻿ / 52.9299; -3.925﻿ (Castell Tomen y Mur), SH705386 | | Merionethshire | 2Roman | ME002 |
| Tomen y Mur | Roman fort | Maentwrog | 52°55′39″N 3°55′17″W﻿ / ﻿52.9276°N 3.9214°W﻿ / 52.9276; -3.9214﻿ (Tomen y Mur), SH709384 | | Merionethshire | 2Roman | ME078 |
| Cefn-Caer Roman Site | Roman fort | Pennal | 52°35′00″N 3°54′45″W﻿ / ﻿52.5832°N 3.9125°W﻿ / 52.5832; -3.9125﻿ (Cefn-Caer Roman Site), SH705000 | | Merionethshire | 2Roman | ME009 |
| Roman Bath-House, Tremadoc | Bath-house | Porthmadog | 52°56′21″N 4°08′54″W﻿ / ﻿52.9392°N 4.1482°W﻿ / 52.9392; -4.1482﻿ (Roman Bath-House, Tremadoc), SH557401 | | Caernarvonshire | 2Roman | CN174 |
| Roman Kilns 225m SE of Pen-y-Stryd | Kiln | Trawsfynydd | 52°52′11″N 3°53′30″W﻿ / ﻿52.8697°N 3.8918°W﻿ / 52.8697; -3.8918﻿ (Roman Kilns 225m SE of Pen-y-Stryd), SH727319 | | Merionethshire | 2Roman | ME071 |
| Dol-ddinas Roman Earthworks | Practice camp | Trawsfynydd | 52°55′27″N 3°53′01″W﻿ / ﻿52.9241°N 3.8836°W﻿ / 52.9241; -3.8836﻿ (Dol-ddinas Roman Earthworks), SH734379 | | Merionethshire | 2Roman | ME077 |
| Roman Practice Camp 440m WSW of Braich-ddu | Practice camp | Trawsfynydd | 52°55′39″N 3°54′39″W﻿ / ﻿52.9274°N 3.9109°W﻿ / 52.9274; -3.9109﻿ (Roman Practice Camp 440m WSW of Braich-ddu), SH716383 | | Merionethshire | 2Roman | ME260 |
| Roman Practice Camps 190m W of Llyn Hiraethlyn | Practice camp | Trawsfynydd | 52°54′51″N 3°52′24″W﻿ / ﻿52.9141°N 3.8733°W﻿ / 52.9141; -3.8733﻿ (Roman Practice Camps 190m W of Llyn Hiraethlyn), SH741368 | | Merionethshire | 2Roman | ME261 |
| Roman Road Extending SE 650m from Llyn Hiraethlyn toward Glasgoed | Roman Road | Trawsfynydd | 52°54′49″N 3°52′06″W﻿ / ﻿52.9135°N 3.8683°W﻿ / 52.9135; -3.8683﻿ (Roman Road Extending SE 650m from Llyn Hiraethlyn toward Glasgoed), SH743368 | | Merionethshire | 2Roman | ME262 |
| The Senacus Stone (formerly in Tudweiliog, Dwyfer) | Inscribed stone | Aberdaron | 52°48′14″N 4°42′41″W﻿ / ﻿52.8039°N 4.7113°W﻿ / 52.8039; -4.7113﻿ (The Senacus Stone (formerly in Tudweiliog, Dwyfer)), SH173263 | | Caernarvonshire | 3Early Medieval | CN089 |
| The Veracius Stone (formerly in Tudweiliog, Dwyfer) | Inscribed stone | Aberdaron | 52°48′14″N 4°42′41″W﻿ / ﻿52.8039°N 4.7113°W﻿ / 52.8039; -4.7113﻿ (The Veracius Stone (formerly in Tudweiliog, Dwyfer)), SH173263 | | Caernarvonshire | 3Early Medieval | CN090 |
| Cross-Inscribed Stone in the Chapel, Bardsey Island | Cross-marked stone | Aberdaron | 52°45′51″N 4°47′12″W﻿ / ﻿52.7641°N 4.7868°W﻿ / 52.7641; -4.7868﻿ (Cross-Inscribed Stone in the Chapel, Bardsey Island), SH120221 | | Caernarvonshire | 3Early Medieval | CN141 |
| Inscribed Stone in the Chapel, Bardsey Island | Inscribed stone | Aberdaron | 52°45′51″N 4°47′12″W﻿ / ﻿52.7641°N 4.7868°W﻿ / 52.7641; -4.7868﻿ (Inscribed Stone in the Chapel, Bardsey Island), SH120221 | | Caernarvonshire | 3Early Medieval | CN142 |
| Sundial in Clynnog Fawr Churchyard | Sundial | Clynnog | 53°01′15″N 4°21′56″W﻿ / ﻿53.0208°N 4.3656°W﻿ / 53.0208; -4.3656﻿ (Sundial in Clynnog Fawr Churchyard), SH414496 | | Caernarvonshire | 3Early Medieval | CN062 |
| Cross Inscribed Stone Near Capel Uchaf | Cross-marked stone | Clynnog | 53°01′23″N 4°20′30″W﻿ / ﻿53.023°N 4.3417°W﻿ / 53.023; -4.3417﻿ (Cross Inscribed Stone Near Capel Uchaf), SH430498 | | Caernarvonshire | 3Early Medieval | CN213 |
| Gesail Gyfarch Inscribed Stone | Inscribed stone | Dolbenmaen | 52°57′10″N 4°10′29″W﻿ / ﻿52.9528°N 4.1746°W﻿ / 52.9528; -4.1746﻿ (Gesail Gyfarch Inscribed Stone), SH540417 | | Caernarvonshire | 3Early Medieval | CN019 |
| Llystyn Gwyn Inscribed Stone | Inscribed stone | Dolbenmaen | 52°59′08″N 4°15′45″W﻿ / ﻿52.9855°N 4.2626°W﻿ / 52.9855; -4.2626﻿ (Llystyn Gwyn Inscribed Stone), SH482455 | | Caernarvonshire | 3Early Medieval | CN021 |
| Early Christian Inscribed Stone in the Churchyard, Llanaelhaearn | Inscribed stone | Llanaelhaearn | 52°58′35″N 4°24′15″W﻿ / ﻿52.9764°N 4.4041°W﻿ / 52.9764; -4.4041﻿ (Early Christian Inscribed Stone in the Churchyard, Llanaelhaearn), SH386448 | | Caernarvonshire | 3Early Medieval | CN084 |
| Part of Inscribed Stone Built into Wall of Churchyard | Inscribed stone | Llanaelhaearn | 52°58′35″N 4°24′15″W﻿ / ﻿52.9763°N 4.4041°W﻿ / 52.9763; -4.4041﻿ (Part of Inscribed Stone Built into Wall of Churchyard), SH386448 | | Caernarvonshire | 3Early Medieval | CN085 |
| Inscribed Stone in St Cian's Churchyard, Llangian | Inscribed stone | Llanengan | 52°49′51″N 4°31′53″W﻿ / ﻿52.8309°N 4.5314°W﻿ / 52.8309; -4.5314﻿ (Inscribed Stone in St Cian's Churchyard, Llangian), SH295289 | | Caernarvonshire | 3Early Medieval | CN087 |
| Cross-Incised Stone in Llangybi Churchyard | Cross-marked stone | Llanystumdwy | 52°56′41″N 4°20′25″W﻿ / ﻿52.9447°N 4.3402°W﻿ / 52.9447; -4.3402﻿ (Cross-Incised Stone in Llangybi Churchyard), SH428411 | | Caernarvonshire | 3Early Medieval | CN100 |
| Cross Slab Built into Farm Building Ty'n-y-Cae | Cross-marked stone | Nefyn | 52°56′25″N 4°30′46″W﻿ / ﻿52.9404°N 4.5127°W﻿ / 52.9404; -4.5127﻿ (Cross Slab Built into Farm Building Ty'n-y-Cae), SH312410 | | Caernarvonshire | 3Early Medieval | CN180 |
| Tymawr Cross-Incised Stone | Cross-marked stone | Pistyll | 52°56′50″N 4°30′08″W﻿ / ﻿52.9473°N 4.5023°W﻿ / 52.9473; -4.5023﻿ (Tymawr Cross-Incised Stone), SH319418 | | Caernarvonshire | 3Early Medieval | CN101 |
| Aber Castle Mound (Pen-y-Mwd) | Motte | Aber | 53°14′02″N 4°00′50″W﻿ / ﻿53.2338°N 4.014°W﻿ / 53.2338; -4.014﻿ (Aber Castle Mound (Pen-y-Mwd)), SH656726 | | Caernarvonshire | 4Medieval | CN007 |
| Medieval Homestead 400m SE of Maes y Gaer | Rectangular hut settlement | Aber | 53°13′51″N 3°59′56″W﻿ / ﻿53.2307°N 3.9988°W﻿ / 53.2307; -3.9988﻿ (Medieval Homestead 400m SE of Maes y Gaer), SH666722 | | Caernarvonshire | 4Medieval | CN137 |
| Enclosure & Associated Structures at Pen-y-Bryn | Enclosure | Aber | 53°14′06″N 4°00′43″W﻿ / ﻿53.235°N 4.012°W﻿ / 53.235; -4.012﻿ (Enclosure & Associated Structures at Pen-y-Bryn), SH658727 | | Caernarvonshire | 4Medieval | CN218 |
| St Mary's Abbey, Bardsey Island | Abbey | Aberdaron | 52°45′51″N 4°47′16″W﻿ / ﻿52.7643°N 4.7877°W﻿ / 52.7643; -4.7877﻿ (St Mary's Abbey, Bardsey Island), SH120221 | | Caernarvonshire | 4Medieval | CN068 |
| Site of St Merin's Church | Church | Aberdaron | 52°50′59″N 4°42′51″W﻿ / ﻿52.8498°N 4.7143°W﻿ / 52.8498; -4.7143﻿ (Site of St Merin's Church), SH173314 | | Caernarvonshire | 4Medieval | CN171 |
| Long Houses, Enclosures & Field Systems, Bardsey Island | Rectangular hut | Aberdaron | 52°46′03″N 4°47′27″W﻿ / ﻿52.7674°N 4.7908°W﻿ / 52.7674; -4.7908﻿ (Long Houses, Enclosures & Field Systems, Bardsey Island), SH118225 | | Caernarvonshire | 4Medieval | CN186 |
| Capel Anelog | Chapel | Aberdaron | 52°48′47″N 4°44′16″W﻿ / ﻿52.813°N 4.7377°W﻿ / 52.813; -4.7377﻿ (Capel Anelog), SH155274 | | Caernarvonshire | 4Medieval | CN220 |
| Long House South of Talarfor | Longhouse | Aberdaron | 52°49′27″N 4°37′30″W﻿ / ﻿52.8241°N 4.6251°W﻿ / 52.8241; -4.6251﻿ (Long House South of Talarfor), SH232284 | | Caernarvonshire | 4Medieval | CN318 |
| St Mary's Church | Church | Aberdaron | 52°47′36″N 4°45′40″W﻿ / ﻿52.7934°N 4.7612°W﻿ / 52.7934; -4.7612﻿ (St Mary's Church), SH139253 | | Caernarvonshire | 4Medieval | CN381 |
| Llys Bradwen Medieval Site | Enclosure | Arthog | 52°42′20″N 3°59′57″W﻿ / ﻿52.7055°N 3.9993°W﻿ / 52.7055; -3.9993﻿ (Llys Bradwen Medieval Site), SH650138 | | Merionethshire | 4Medieval | ME022 |
| Cyfannedd-Fach Homestead | Platform house | Arthog | 52°41′44″N 4°01′33″W﻿ / ﻿52.6955°N 4.0257°W﻿ / 52.6955; -4.0257﻿ (Cyfannedd-Fach Homestead), SH631127 | | Merionethshire | 4Medieval | ME101 |
| Tomen y Bala Castle Mound | Motte | Bala | 52°54′41″N 3°35′44″W﻿ / ﻿52.9115°N 3.5955°W﻿ / 52.9115; -3.5955﻿ (Tomen y Bala Castle Mound), SH928360 | | Merionethshire | 4Medieval | ME016 |
| Ty'n Twr | Building (Unclassified) | Bethesda | 53°10′24″N 4°03′26″W﻿ / ﻿53.1734°N 4.0571°W﻿ / 53.1734; -4.0571﻿ (Ty'n Twr), SH626660 | | Caernarvonshire | 4Medieval | CN219 |
| Hafod-y-Wern Long Hut | Rectangular hut | Betws Garmon | 53°05′32″N 4°12′06″W﻿ / ﻿53.0922°N 4.2016°W﻿ / 53.0922; -4.2016﻿ (Hafod-y-Wern Long Hut), SH526572 | | Caernarvonshire | 4Medieval | CN307 |
| Ystrad Rural Settlement | Deserted Rural Settlement | Betws Garmon | 53°05′37″N 4°10′29″W﻿ / ﻿53.0935°N 4.1746°W﻿ / 53.0935; -4.1746﻿ (Ystrad Rural Settlement), SH544573 | | Caernarvonshire | 4Medieval | CN316 |
| Cored Gwyrfai Fish Weir | Fish weir | Bontnewydd | 53°07′22″N 4°18′54″W﻿ / ﻿53.1228°N 4.3151°W﻿ / 53.1228; -4.3151﻿ (Cored Gwyrfai Fish Weir), SH453607 | | Caernarvonshire | 4Medieval | CN334 |
| Castell Cynfal, Bryn Crug | Motte | Bryn-crug | 52°35′41″N 4°02′46″W﻿ / ﻿52.5946°N 4.0462°W﻿ / 52.5946; -4.0462﻿ (Castell Cynfal, Bryn Crug), SH615016 | | Merionethshire | 4Medieval | ME121 |
| Caernarfon Town Walls | Town Wall | Caernarfon | 53°08′28″N 4°16′31″W﻿ / ﻿53.141°N 4.2754°W﻿ / 53.141; -4.2754﻿ (Caernarfon Town Wall), SH479626 | | Caernarvonshire | 4Medieval | CN034 |
| Caernarfon Castle | Castle | Caernarfon | 53°08′22″N 4°16′37″W﻿ / ﻿53.1394°N 4.277°W﻿ / 53.1394; -4.277﻿ (Caernarfon Castle), SH477626 | | Caernarvonshire | 4Medieval | CN079 |
| St Beuno's Well | Holy Well | Clynnog | 53°01′08″N 4°22′01″W﻿ / ﻿53.0188°N 4.367°W﻿ / 53.0188; -4.367﻿ (St Beuno's Well), SH413494 | | Caernarvonshire | 4Medieval | CN091 |
| Long Hut North of Cwm Farm | Rectangular hut | Clynnog | 52°59′19″N 4°19′58″W﻿ / ﻿52.9887°N 4.3327°W﻿ / 52.9887; -4.3327﻿ (Long Hut North of Cwm Farm), SH435460 | | Caernarvonshire | 4Medieval | CN309 |
| Criccieth Castle | Castle | Criccieth | 52°54′58″N 4°13′57″W﻿ / ﻿52.916°N 4.2324°W﻿ / 52.916; -4.2324﻿ (Criccieth Castle), SH499377 | | Caernarvonshire | 4Medieval | CN015 |
| Criccieth Castle, Outer Bank Defences | Castle | Criccieth | 52°54′57″N 4°14′02″W﻿ / ﻿52.9157°N 4.2338°W﻿ / 52.9157; -4.2338﻿ (Criccieth Castle, Outer Bank Defences), SH499377 | | Caernarvonshire | 4Medieval | CN173 |
| Dolbenmaen Castle Mound | Motte | Dolbenmaen | 52°57′51″N 4°13′30″W﻿ / ﻿52.9642°N 4.2251°W﻿ / 52.9642; -4.2251﻿ (Dolbenmaen Castle Mound), SH506430 | | Caernarvonshire | 4Medieval | CN063 |
| Maes Coch Deserted Rural Settlement | Rectangular hut settlement | Dolgellau | 52°43′16″N 3°51′42″W﻿ / ﻿52.721°N 3.8617°W﻿ / 52.721; -3.8617﻿ (Maes Coch Deserted Rural Settlement), SH743153 | | Merionethshire | 4Medieval | ME196 |
| Settlement & Fields Systems above Egryn Abbey | House platform | Dyffryn Ardudwy | 52°45′42″N 4°04′10″W﻿ / ﻿52.7617°N 4.0695°W﻿ / 52.7617; -4.0695﻿ (Settlement & Fields Systems above Egryn Abbey), SH604202 | | Merionethshire | 4Medieval | ME122 |
| Eithin-Fynydd Platform House Settlement | Deserted Rural Settlement | Dyffryn Ardudwy | 52°46′30″N 4°04′38″W﻿ / ﻿52.7749°N 4.0771°W﻿ / 52.7749; -4.0771﻿ (Eithin-Fynydd Platform House Settlement), SH599217 | | Merionethshire | 4Medieval | ME202 |
| Deserted Rural Settlement South of Ffridd Olchfa | Deserted Rural Settlement | Dyffryn Ardudwy | 52°44′47″N 4°03′35″W﻿ / ﻿52.7465°N 4.0598°W﻿ / 52.7465; -4.0598﻿ (Deserted Rural Settlement South of Ffridd Olchfa), SH610185 | | Merionethshire | 4Medieval | ME203 |
| Harlech Castle | Castle | Harlech | 52°51′37″N 4°06′33″W﻿ / ﻿52.8602°N 4.1091°W﻿ / 52.8602; -4.1091﻿ (Harlech Castle), SH581312 | | Merionethshire | 4Medieval | ME044 |
| Medieval Ecclesiastical Structure SE of Ty'n y Coed Cottage | Chapel | Llanbedr | 52°49′35″N 4°05′18″W﻿ / ﻿52.8265°N 4.0882°W﻿ / 52.8265; -4.0882﻿ (Medieval Ecclesiastical Structure SE of Ty'n y Coed Cottage), SH594274 | | Merionethshire | 4Medieval | ME249 |
| Dolbadarn Castle | Castle | Llanberis | 53°07′00″N 4°06′51″W﻿ / ﻿53.1166°N 4.1143°W﻿ / 53.1166; -4.1143﻿ (Dolbadarn Castle), SH586598 | | Caernarvonshire | 4Medieval | CN066 |
| Cwm Brwynog Deserted Rural Settlement | Deserted Rural Settlement | Llanberis | 53°05′24″N 4°06′06″W﻿ / ﻿53.0901°N 4.1017°W﻿ / 53.0901; -4.1017﻿ (Cwm Brwynog Deserted Rural Settlement), SH594574 | | Caernarvonshire | 4Medieval | CN315 |
| Rectangular Earthwork 110m NW of Coed Ty Mawr | Moated Site | Llanddeiniolen | 53°10′31″N 4°09′46″W﻿ / ﻿53.1753°N 4.1629°W﻿ / 53.1753; -4.1629﻿ (Rectangular Earthwork 110m NW of Coed Ty Mawr), SH555664 | | Caernarvonshire | 4Medieval | CN156 |
| Castell Llanddeiniolen | Motte | Llanddeiniolen | 53°10′04″N 4°08′29″W﻿ / ﻿53.1677°N 4.1414°W﻿ / 53.1677; -4.1414﻿ (Castell Llanddeiniolen), SH569655 | | Caernarvonshire | 4Medieval | CN197 |
| Llys Dinorwig | Enclosure | Llanddeiniolen | 53°08′47″N 4°09′03″W﻿ / ﻿53.1463°N 4.1508°W﻿ / 53.1463; -4.1508﻿ (Llys Dinorwig), SH562631 | | Caernarvonshire | 4Medieval | CN223 |
| Pen-Ucha'r-Llan Ringwork | Ringwork | Llandderfel | 52°55′07″N 3°34′50″W﻿ / ﻿52.9186°N 3.5805°W﻿ / 52.9186; -3.5805﻿ (Pen-Ucha'r-Llan Ringwork), SH938368 | | Merionethshire | 4Medieval | ME042 |
| Domen Ddreiniog | Motte | Llanegryn | 52°36′44″N 4°04′25″W﻿ / ﻿52.6121°N 4.0737°W﻿ / 52.6121; -4.0737﻿ (Domen Ddreiniog), SH596036 | | Merionethshire | 4Medieval | ME054 |
| Cymer Abbey | Abbey | Llanelltyd | 52°45′29″N 3°53′46″W﻿ / ﻿52.7581°N 3.8962°W﻿ / 52.7581; -3.8962﻿ (Cymer Abbey), SH721195 | | Merionethshire | 4Medieval | ME001 |
| Cymmer Castle | Motte | Llanelltyd | 52°45′31″N 3°52′51″W﻿ / ﻿52.7585°N 3.8808°W﻿ / 52.7585; -3.8808﻿ (Cymmer Castle), SH731195 | | Merionethshire | 4Medieval | ME150 |
| Castell y Bere | Castle | Llanfihangel-y-Pennant | 52°39′30″N 3°58′16″W﻿ / ﻿52.6583°N 3.9711°W﻿ / 52.6583; -3.9711﻿ (Castell y Bere), SH667085 | | Merionethshire | 4Medieval | ME023 |
| Pont Maesgwm Deserted Rural Settlement | Deserted Rural Settlement | Llanfrothen | 52°58′34″N 4°01′57″W﻿ / ﻿52.976°N 4.0324°W﻿ / 52.976; -4.0324﻿ (Pont Maesgwm Deserted Rural Settlement), SH635440 | | Merionethshire | 4Medieval | ME193 |
| Castell Gronw Castle Mound | Motte | Llangywer | 52°54′07″N 3°35′32″W﻿ / ﻿52.902°N 3.5921°W﻿ / 52.902; -3.5921﻿ (Castell Gronw Castle Mound), SH930350 | | Merionethshire | 4Medieval | ME067 |
| Huts 90m N of Cil Twllan | Platform house | Llanllechid | 53°10′40″N 4°02′25″W﻿ / ﻿53.1779°N 4.0403°W﻿ / 53.1779; -4.0403﻿ (Huts 90m N of Cil Twllan), SH637664 | | Caernarvonshire | 4Medieval | CN144 |
| Cwm Caseg Deserted Rural Settlement | Deserted Rural Settlement | Llanllechid | 53°10′39″N 4°01′31″W﻿ / ﻿53.1774°N 4.0254°W﻿ / 53.1774; -4.0254﻿ (Cwm Caseg Deserted Rural Settlement), SH647664 | | Caernarvonshire | 4Medieval | CN314 |
| Ty-Newydd Mound & Bailey Castle | Motte & Bailey | Llannor | 52°55′00″N 4°27′37″W﻿ / ﻿52.9166°N 4.4604°W﻿ / 52.9166; -4.4604﻿ (Ty-Newydd Mound & Bailey Castle), SH346383 | | Caernarvonshire | 4Medieval | CN096 |
| Castell Carn Dochan | Castle | Llanuwchllyn | 52°51′40″N 3°42′50″W﻿ / ﻿52.861°N 3.7139°W﻿ / 52.861; -3.7139﻿ (Castell Carn Dochan), SH847306 | | Merionethshire | 4Medieval | ME049 |
| Tomen Fawr | Ringwork | Llanystumdwy | 52°54′50″N 4°18′01″W﻿ / ﻿52.9139°N 4.3002°W﻿ / 52.9139; -4.3002﻿ (Tomen Fawr), SH454376 | | Caernarvonshire | 4Medieval | CN031 |
| Ffynnon Gybi | Holy Well | Llanystumdwy | 52°56′44″N 4°20′32″W﻿ / ﻿52.9456°N 4.3421°W﻿ / 52.9456; -4.3421﻿ (Ffynnon Gybi), SH427412 | | Caernarvonshire | 4Medieval | CN037 |
| Penarth Fawr Medieval House | House (domestic) | Llanystumdwy | 52°54′48″N 4°21′09″W﻿ / ﻿52.9132°N 4.3524°W﻿ / 52.9132; -4.3524﻿ (Penarth Fawr Medieval Hall), SH419376 | | Caernarvonshire | 4Medieval | CN086 |
| Tomen Las Castle Mound | Motte | Pennal | 52°35′04″N 3°55′28″W﻿ / ﻿52.5845°N 3.9245°W﻿ / 52.5845; -3.9245﻿ (Tomen Las Castle Mound), SH697002 | | Merionethshire | 4Medieval | ME043 |
| Inscribed Stone in Llanfihangel Traethau Churchyard | Inscribed stone | Talsarnau | 52°53′51″N 4°05′25″W﻿ / ﻿52.8975°N 4.0902°W﻿ / 52.8975; -4.0902﻿ (Inscribed Stone in Llanfihangel Traethau Churchyard), SH595353 | | Merionethshire | 4Medieval | ME050 |
| Llidiart-Garw Platform House and Paddock | Platform house | Talsarnau | 52°52′42″N 4°03′51″W﻿ / ﻿52.8784°N 4.0641°W﻿ / 52.8784; -4.0641﻿ (Llidiart-Garw Platform House and Paddock), SH611332 | | Merionethshire | 4Medieval | ME112 |
| Castell Prysor | Motte & Bailey | Trawsfynydd | 52°54′53″N 3°50′55″W﻿ / ﻿52.9148°N 3.8487°W﻿ / 52.9148; -3.8487﻿ (Castell Prysor), SH757368 | | Merionethshire | 4Medieval | ME045 |
| Bont-Newydd | Bridge | Aber | 53°13′42″N 4°00′18″W﻿ / ﻿53.2282°N 4.0049°W﻿ / 53.2282; -4.0049﻿ (Bont-Newydd), SH662720 | | Caernarvonshire | 5Post-Medieval/Modern | CN061 |
| Cwm Erch Copper Mine | Copper mine | Beddgelert | 53°03′25″N 4°02′24″W﻿ / ﻿53.057°N 4.04°W﻿ / 53.057; -4.04﻿ (Cwm Erch Copper Mine), SH633530 | | Caernarvonshire | 5Post-Medieval/Modern | CN193 |
| Glasdir Copper and Gold Mine Mill | Mill | Brithdir and Llanfachreth | 52°47′09″N 3°52′17″W﻿ / ﻿52.7857°N 3.8715°W﻿ / 52.7857; -3.8715﻿ (Glasdir Copper and Gold Mine Mill), SH738225 | | Merionethshire | 5Post-Medieval/Modern | ME206 |
| Pont y Cim | Bridge | Clynnog | 53°02′43″N 4°19′35″W﻿ / ﻿53.0452°N 4.3263°W﻿ / 53.0452; -4.3263﻿ (Pont y Cim), SH441523 | | Caernarvonshire | 5Post-Medieval/Modern | CN053 |
| Water Balance Incline at Aberllefenni Slate Quarry | Incline | Corris | 52°40′29″N 3°49′26″W﻿ / ﻿52.6746°N 3.824°W﻿ / 52.6746; -3.824﻿ (Water Balance Incline at Aberllefenni Slate Quarry), SH767101 | | Merionethshire | 5Post-Medieval/Modern | ME185 |
| Gorseddau or Ynysypandy Slate Factory | Slate mill | Dolbenmaen | 52°58′05″N 4°09′35″W﻿ / ﻿52.9681°N 4.1598°W﻿ / 52.9681; -4.1598﻿ (Gorseddau or Ynysypandy Slate Factory), SH550433 | | Caernarvonshire | 5Post-Medieval/Modern | CN160 |
| Gilfach Copper Mine | Copper mine | Dolbenmaen | 53°00′25″N 4°11′54″W﻿ / ﻿53.0069°N 4.1984°W﻿ / 53.0069; -4.1984﻿ (Gilfach Copper Mine), SH526477 | | Caernarvonshire | 5Post-Medieval/Modern | CN170 |
| Gorseddau Slate Quarry | Railway | Dolbenmaen | 52°59′09″N 4°07′40″W﻿ / ﻿52.9858°N 4.1279°W﻿ / 52.9858; -4.1279﻿ (Gorseddau Slate Quarry), SH572452 | | Caernarvonshire | 5Post-Medieval/Modern | CN303 |
| Treforys Deserted Quarry Settlement | Settlement | Dolbenmaen | 52°59′11″N 4°08′42″W﻿ / ﻿52.9865°N 4.1451°W﻿ / 52.9865; -4.1451﻿ (Treforys Deserted Quarry Settlement), SH560453 | | Caernarvonshire | 5Post-Medieval/Modern | CN321 |
| Pont Scethin | Bridge | Dyffryn Ardudwy | 52°47′32″N 4°01′35″W﻿ / ﻿52.7922°N 4.0265°W﻿ / 52.7922; -4.0265﻿ (Pont Scethin), SH634235 | | Merionethshire | 5Post-Medieval/Modern | ME126 |
| Pont Dol-y-Moch | Bridge | Ffestiniog | 52°57′22″N 3°57′33″W﻿ / ﻿52.9561°N 3.9592°W﻿ / 52.9561; -3.9592﻿ (Pont Dol-y-Moch), SH685416 | | Merionethshire | 5Post-Medieval/Modern | ME039 |
| Berth-Llwyd & Cefn Coch Gold Mining Complex | Mill | Ganllwyd | 52°47′36″N 3°54′13″W﻿ / ﻿52.7932°N 3.9035°W﻿ / 52.7932; -3.9035﻿ (Berth-Llwyd & Cefn Coch Gold Mining Complex), SH717233 | | Merionethshire | 5Post-Medieval/Modern | ME119 |
| Hermon or Dolfwynog Copper/Gold Bog Kiln | Kiln | Ganllwyd | 52°48′43″N 3°52′18″W﻿ / ﻿52.812°N 3.8716°W﻿ / 52.812; -3.8716﻿ (Hermon or Dolfwynog Copper/Gold Bog Kiln), SH739254 | | Merionethshire | 5Post-Medieval/Modern | ME198 |
| Cwm Heisian West Lead and Gold Mine | Mill | Ganllwyd | 52°50′03″N 3°52′34″W﻿ / ﻿52.8343°N 3.876°W﻿ / 52.8343; -3.876﻿ (Cwm Heisian West Lead and Gold Mine), SH737279 | | Merionethshire | 5Post-Medieval/Modern | ME204 |
| Pont Llanbedr | Bridge | Llanbedr | 52°49′13″N 4°06′02″W﻿ / ﻿52.8203°N 4.1006°W﻿ / 52.8203; -4.1006﻿ (Pont Llanbedr), SH585268 | | Merionethshire | 5Post-Medieval/Modern | ME026 |
| Dinorwic Quarry: Hafod Owen Winding Engine, Locomotive Shed, Main Waterwheel and Housing | Wheelhouse | Llanddeiniolen | 53°07′13″N 4°06′55″W﻿ / ﻿53.1203°N 4.1154°W﻿ / 53.1203; -4.1154﻿ (Dinorwic Quarry: Hafod Owen Winding Engine, Locomotive Shed, Main Waterwheel and Housing), SH585602 | | Caernarvonshire | 5Post-Medieval/Modern | CN163 |
| Dinorwic Quarry Barracks 'A' Incline | Barracks | Llanddeiniolen | 53°07′12″N 4°06′39″W﻿ / ﻿53.12°N 4.1108°W﻿ / 53.12; -4.1108﻿ (Dinorwic Quarry Barracks 'A' Incline), SH586601 | | Caernarvonshire | 5Post-Medieval/Modern | CN177 |
| Vivian Slate Quarry, Inclines, Walia & associated structures | Incline | Llanddeiniolen | 53°07′28″N 4°06′51″W﻿ / ﻿53.1244°N 4.1141°W﻿ / 53.1244; -4.1141﻿ (Vivian Slate Quarry, Inclines, Walia & associated structures), SH586606 | | Caernarvonshire | 5Post-Medieval/Modern | CN198 |
| Dinorwic Quarry | Slate mill | Llanddeiniolen | 53°07′25″N 4°05′48″W﻿ / ﻿53.1236°N 4.0966°W﻿ / 53.1236; -4.0966﻿ (Dinorwic Quarry), SH597605 | | Caernarvonshire | 5Post-Medieval/Modern | CN337 |
| Pont Fawr | Bridge | Llandderfel | 52°55′02″N 3°30′56″W﻿ / ﻿52.9171°N 3.5155°W﻿ / 52.9171; -3.5155﻿ (Pont Fawr), SH982366 | | Merionethshire | 5Post-Medieval/Modern | ME027 |
| Dinas Dinlle Seagull Trench | Seagull Trench | Llandwrog | 53°04′59″N 4°20′07″W﻿ / ﻿53.0831°N 4.3354°W﻿ / 53.0831; -4.3354﻿ (Dinas Dinlle Seagull Trench), SH436565 | | Caernarvonshire | 5Post-Medieval/Modern | CN396 |
| Slate Gwaliau at Felin Fawr, Penrhyn | Wall | Llandygai | 53°10′37″N 4°04′26″W﻿ / ﻿53.1769°N 4.074°W﻿ / 53.1769; -4.074﻿ (Slate Gwaliau at Felin Fawr, Penrhyn), SH614664 | | Caernarvonshire | 5Post-Medieval/Modern | CN297 |
| Ogwen Fish Weir | Fish weir | Llandygai | 53°14′25″N 4°05′39″W﻿ / ﻿53.2404°N 4.0943°W﻿ / 53.2404; -4.0943﻿ (Ogwen Fish Weir), SH600730 | | Caernarvonshire | 5Post-Medieval/Modern | CN335 |
| Cegin Viaduct (Penrhyn Railroad) | Viaduct | Llandygai | 53°13′48″N 4°06′35″W﻿ / ﻿53.2299°N 4.1098°W﻿ / 53.2299; -4.1098﻿ (Cegin Viaduct (Penrhyn Railroad)), SH592723 | | Caernarvonshire | 5Post-Medieval/Modern | CN380 |
| Llanelltyd Bridge | Bridge | Llanelltyd | 52°45′22″N 3°54′04″W﻿ / ﻿52.7562°N 3.901°W﻿ / 52.7562; -3.901﻿ (Llanelltyd Bridge), SH718193 | | Merionethshire | 5Post-Medieval/Modern | ME006 |
| Water Powered Chain Incline at Bryneglwys Slate Quarry | Water Power System | Llanfihangel-y-Pennant | 52°37′44″N 3°55′55″W﻿ / ﻿52.6289°N 3.9319°W﻿ / 52.6289; -3.9319﻿ (Water Powered Chain Incline at Bryneglwys Slate Quarry), SH693052 | | Merionethshire | 5Post-Medieval/Modern | ME186 |
| Alltwyllt Slate Quarry Incline | Incline | Llanfihangel-y-Pennant | 52°38′27″N 3°57′01″W﻿ / ﻿52.6407°N 3.9503°W﻿ / 52.6407; -3.9503﻿ (Alltwyllt Slate Quarry Incline), SH681065 | | Merionethshire | 5Post-Medieval/Modern | ME205 |
| Rhosydd Incline, Drumhouse & Tramway | Industrial monument | Llanfrothen | 52°59′52″N 4°00′05″W﻿ / ﻿52.9977°N 4.0013°W﻿ / 52.9977; -4.0013﻿ (Rhosydd Incline, Drumhouse & Tramway), SH657463 | | Merionethshire | 5Post-Medieval/Modern | ME142 |
| Corn Drying Kiln Near Carn-Gadell Uchaf | Kiln | Llangelynnin | 52°39′18″N 4°05′14″W﻿ / ﻿52.655°N 4.0871°W﻿ / 52.655; -4.0871﻿ (Corn Drying Kiln Near Carn-Gadell Uchaf), SH589084 | | Merionethshire | 5Post-Medieval/Modern | ME116 |
| The Holyhead Road: the Ogwen Pass | Road | Llanllechid | 53°07′39″N 4°01′21″W﻿ / ﻿53.1276°N 4.0226°W﻿ / 53.1276; -4.0226﻿ (The Holyhead Road: the Ogwen Pass), SH647608 | | Caernarvonshire | 5Post-Medieval/Modern | CN338 |
| Drws y Coed Copper Mine | Copper mine | Llanllyfni | 53°03′29″N 4°10′15″W﻿ / ﻿53.0581°N 4.1707°W﻿ / 53.0581; -4.1707﻿ (Drws y Coed Copper Mine), SH546534 | | Caernarvonshire | 5Post-Medieval/Modern | CN162 |
| Dorothea Quarry Beam Engine | Engine house | Llanllyfni | 53°03′15″N 4°14′37″W﻿ / ﻿53.0542°N 4.2435°W﻿ / 53.0542; -4.2435﻿ (Dorothea Quarry Beam Engine), SH497531 | | Caernarvonshire | 5Post-Medieval/Modern | CN165 |
| Dorothea Quarry, Pyramids, Inclines, Mill & Winding Houses, etc. | Engine house | Llanllyfni | 53°03′13″N 4°14′21″W﻿ / ﻿53.0537°N 4.2393°W﻿ / 53.0537; -4.2393﻿ (Dorothea Quarry, Pyramids, Inclines, Mill & Winding Houses, etc), SH500530 | | Caernarvonshire | 5Post-Medieval/Modern | CN199 |
| Pen-yr-Orsedd Quarry, Blondins and Associated Structures | Engine house | Llanllyfni | 53°03′49″N 4°13′35″W﻿ / ﻿53.0635°N 4.2265°W﻿ / 53.0635; -4.2265﻿ (Pen-yr-Orsedd Quarry, Blondins and Associated Structures), SH509541 | | Caernarvonshire | 5Post-Medieval/Modern | CN208 |
| Ty Mawr East Slate Quarry Winding Engine House | Engine house | Llanllyfni | 53°02′57″N 4°14′27″W﻿ / ﻿53.0492°N 4.2407°W﻿ / 53.0492; -4.2407﻿ (Ty Mawr East Slate Quarry Winding Engine House), SH499525 | | Caernarvonshire | 5Post-Medieval/Modern | CN300 |
| Blaen y Cae Slate Quarry | Unclassified site | Llanllyfni | 53°03′33″N 4°14′35″W﻿ / ﻿53.0591°N 4.243°W﻿ / 53.0591; -4.243﻿ (Blaen y Cae Slate Quarry), SH497536 | | Caernarvonshire | 5Post-Medieval/Modern | CN301 |
| Cloddfa'r Lon Slate Quarry | Slate mill | Llanllyfni | 53°03′23″N 4°14′08″W﻿ / ﻿53.0564°N 4.2356°W﻿ / 53.0564; -4.2356﻿ (Cloddfa'r Lon Slate Quarry), SH503534 | | Caernarvonshire | 5Post-Medieval/Modern | CN302 |
| Pont Tai-Hirion Old Bridge | Bridge | Llanycil | 52°56′33″N 3°46′56″W﻿ / ﻿52.9424°N 3.7821°W﻿ / 52.9424; -3.7821﻿ (Pont Tai-Hirion Old Bridge), SH803398 | | Merionethshire | 5Post-Medieval/Modern | ME028 |
| Capel Gallt-Coed | Chapel | Llanystumdwy | 52°56′18″N 4°16′37″W﻿ / ﻿52.9382°N 4.277°W﻿ / 52.9382; -4.277﻿ (Capel Gallt-Coed), SH470402 | | Caernarvonshire | 5Post-Medieval/Modern | CN117 |
| Afon Cynfal Deserted Rural Settlement | Rectangular hut settlement | Maentwrog | 52°57′17″N 3°51′35″W﻿ / ﻿52.9547°N 3.8597°W﻿ / 52.9547; -3.8597﻿ (Afon Cynfal Deserted Rural Settlement), SH751413 | | Merionethshire | 5Post-Medieval/Modern | ME190 |
| Afon Goch Deserted Rural Settlement | Longhouse | Maentwrog | 52°57′00″N 3°51′30″W﻿ / ﻿52.9501°N 3.8582°W﻿ / 52.9501; -3.8582﻿ (Afon Goch Deserted Rural Settlement), SH753407 | | Merionethshire | 5Post-Medieval/Modern | ME191 |
| Pont Minllyn | Bridge | Mawddwy | 52°42′38″N 3°41′21″W﻿ / ﻿52.7106°N 3.6891°W﻿ / 52.7106; -3.6891﻿ (Pont Minllyn), SH859138 | | Merionethshire | 5Post-Medieval/Modern | ME094 |
| Machynlleth Bridge | Bridge | Pennal, (also Machynlleth), (see also Powys) | 52°36′02″N 3°51′21″W﻿ / ﻿52.6005°N 3.8557°W﻿ / 52.6005; -3.8557﻿ (Machynlleth Bridge), SH744019 | Also known as Pont ar Dyfi | Merionethshire | 5Post-Medieval/Modern | MG002 |
| Cei Tyddyn Isa | Quarry | Penrhyndeudraeth | 52°56′05″N 4°02′28″W﻿ / ﻿52.9348°N 4.0412°W﻿ / 52.9348; -4.0412﻿ (Cei Tyddyn Isa), SH629395 | | Merionethshire | 5Post-Medieval/Modern | ME108 |
| Pen-y-Gwryd Pillboxes | Pillbox | Beddgelert | 53°04′48″N 4°00′13″W﻿ / ﻿53.0799°N 4.0036°W﻿ / 53.0799; -4.0036﻿ (Pen-y-Gwryd Pillboxes), SH659555 | | Caernarvonshire | 5.9Post-Medieval/Modern | CN397 |
| Fairbourne Anti-invasion Defences | Anti-invasion defence site | Arthog | 52°41′54″N 4°03′26″W﻿ / ﻿52.6983°N 4.0571°W﻿ / 52.6983; -4.0571﻿ (Fairbourne Anti-invasion Defences), SH610131 | The tank traps stretch for some 3 kilometres (1.9 mi) along the beach | Merionethshire | 5.9Post Medieval/Modern | ME252 |
| Anti-invasion Defences 630m E of Cae'r-tyddyn | Anti-tank Obstacle | Brithdir and Llanfachreth | 52°44′23″N 3°47′07″W﻿ / ﻿52.7396°N 3.7854°W﻿ / 52.7396; -3.7854﻿ (Anti-invasion Defences 630m E of Cae'r-tyddyn), SH795172 | | Merionethshire | 5.9Post-Medieval/Modern | ME250 |
| Nant Ffrancon Anti-invasion Defences | Anti-invasion defence site | Llandygai, (also Capel Curig), (see also Conwy) | 53°07′31″N 4°01′20″W﻿ / ﻿53.1252°N 4.0222°W﻿ / 53.1252; -4.0222﻿ (Nant Ffrancon Anti-invasion Defences), SH647605 | | Caernarvonshire | 5.9Post-Medieval/Modern | CN399 |
| Anti-invasion Defences 2000m NE of Cwmrhwyddfor Farm | Anti-tank Obstacle | Llanfihangel-y-Pennant | 52°42′13″N 3°50′57″W﻿ / ﻿52.7036°N 3.8492°W﻿ / 52.7036; -3.8492﻿ (Anti-invasion Defences 2000m NE of Cwmrhwyddfor Farm), SH751133 | | Merionethshire | 5.9Post-Medieval/Modern | ME251 |
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