Question: In what year was the World Heritage site believed to date back to the third millennium BC named as a World Heritage Site ?

text: List of World Heritage Sites in the United Kingdom
List of sites
The table lists information about each World Heritage Site : In danger
The United Nations Educational, Scientific and Cultural Organization (UNESCO) World Heritage Sites are places of importance to cultural or natural heritage as described in the UNESCO World Heritage Convention, established in 1972. There are 32 UNESCO World Heritage Sites in the United Kingdom and the British Overseas Territories. The UNESCO list contains one designated site in both England and Scotland (the Frontiers of the Roman Empire) plus eighteen exclusively in England, five in Scotland, three in Wales, one in Northern Ireland, and one in each of the overseas territories of Bermuda, Gibraltar, the Pitcairn Islands, and Saint Helena. The first sites in the UK to be inscribed on the World Heritage List were Giant's Causeway and Causeway Coast; Durham Castle and Cathedral; Ironbridge Gorge; Studley Royal Park including the Ruins of Fountains Abbey; Stonehenge, Avebury and Associated Sites; and the Castles and Town Walls of King Edward in Gwynedd in 1986. The latest site to be inscribed was the Jodrell Bank Observatory in England in July 2019. The constitution of the United Nations Educational, Scientific and Cultural Organization (commonly referred to as UNESCO) was ratified in 1946 by 26 countries, including the UK. Its purpose was to provide for the conservation and protection of the worlds inheritance of books, works of art and monuments of history and science. The UK contributes £130,000 annually to the World Heritage Fund which finances the preservation of sites in developing countries. Some designated properties contain multiple sites that share a common geographical location or cultural heritage. The United Kingdom National Commission for UNESCO advises the British government, which is responsible for maintaining its World Heritage Sites, on policies regarding UNESCO. The UK National Commission for UNESCO conducted research in 2014-15 on the Wider Value of UNESCO to the UK, and found that the UK's World Heritage Sites generated an estimated £85 million from April 2014 to March 2015 through their association with the global network. World Heritage Site selection criteria i-vi are culturally related, and selection criteria vii-x are the natural criteria.
Name Location Date UNESCO data Description
Blaenavon Industrial Landscape Blaenavon , Wales 51°47′N 3°05′W / 51.78°N 3.08°W / 51.78 ; -3.08 ( Blaenavon Industrial Landscape ) 19th century 984 ; 2000 ; iii , iv In the 19th century , Wales was the world 's foremost producer of iron and coal . Blaenavon is an example of the landscape created by the industrial processes associated with the production of these materials . The site includes quarries , public buildings , workers ' housing , and a railway
Blenheim Palace Woodstock , Oxfordshire , England 51°50′28″N 1°21′40″W / 51.841°N 1.361°W / 51.841 ; -1.361 ( Blenheim Palace ) 1705-1722 425 ; 1987 ; ii , iv Blenheim Palace , the residence of John Churchill , 1st Duke of Marlborough , was designed by architects John Vanbrugh and Nicholas Hawksmoor . The associated park was landscaped by Capability Brown . The palace celebrated victory over the French and is significant for establishing English Romantic Architecture as a separate entity from French Classical Architecture
Canterbury Cathedral , St Augustine 's Abbey , and St Martin 's Church Canterbury , Kent , England 51°17′N 1°05′E / 51.28°N 1.08°E / 51.28 ; 1.08 ( Canterbury Cathedral , St Augustine 's Abbey , and St Martin 's Church ) 11th century 496 ; 1988 ; i , ii , vi St Martin 's Church is the oldest church in England . The church and St Augustine 's Abbey were founded during the early stages of the introduction of Christianity to the Anglo-Saxons . The cathedral exhibits Romanesque and Gothic architecture , and is the seat of the Church of England
Castles and Town Walls of King Edward in Gwynedd Conwy , Isle of Anglesey and Gwynedd , Wales 53°08′20″N 4°16′34″W / 53.139°N 4.276°W / 53.139 ; -4.276 ( Castles and Town Walls of King Edward in Gwynedd ) 13th-14th centuries 374 ; 1986 ; i , iii , iv During the reign of Edward I of England ( 1272-1307 ) , a series of castles was constructed in Wales with the purpose of subduing the population and establishing English colonies in Wales . The World Heritage Site covers many castles including Beaumaris , Caernarfon , Conwy , and Harlech . The castles of Edward I are considered the pinnacle of military architecture by military historians
City of Bath Bath , Somerset , England 51°22′48″N 2°21′36″W / 51.380°N 2.360°W / 51.380 ; -2.360 ( City of Bath ) 1st-19th centuries 428 ; 1987 ; i , ii , iv Founded by the Romans as a spa , an important centre of the wool industry in the medieval period , and a spa town in the 18th century , Bath has a varied history . The city is preserved for its Roman remains and Palladian architecture
Cornwall and West Devon Mining Landscape Cornwall and Devon , England 50°08′N 5°23′W / 50.13°N 5.38°W / 50.13 ; -5.38 ( Cornwall and West Devon Mining Landscape ) 18th and 19th centuries 1,215 ; 2006 ; ii , iii , iv Tin and copper mining in Devon and Cornwall boomed in the 18th and 19th centuries , and at its peak the area produced two-thirds of the world 's copper . The techniques and technology involved in deep mining developed in Devon and Cornwall were used around the world
Derwent Valley Mills Derwent Valley , Derbyshire , England 53°01′12″N 1°29′56″W / 53.020°N 1.499°W / 53.020 ; -1.499 ( Derwent Valley Mills ) 18th and 19th centuries 1,030 ; 2001 ; ii , iv The Derwent Valley Mills was the birthplace of the factory system ; the innovations in the valley , including the development of workers ' housing - such as at Cromford - and machines such as the water frame , were important in the Industrial Revolution . The Derwent Valley Mills influenced North America and Europe
Dorset and East Devon Coast Dorset and Devon , England 50°42′N 2°59′W / 50.70°N 2.98°W / 50.70 ; -2.98 ( Dorset and East Devon Coast ) N/A 1029 ; 2001 ; viii The cliffs that make up the Dorset and Devon coast are an important site for fossils and provide a continuous record of life on land and in the sea in the area since 185 million years ago
Durham Castle and Cathedral Durham , County Durham , England 54°46′26″N 1°34′30″W / 54.774°N 1.575°W / 54.774 ; -1.575 ( Durham Castle and Cathedral ) 11th and 12th centuries 370 ; 1986 ; ii , iv , vi Durham Cathedral is the largest and finest example of Norman architecture in England and vaulting of the cathedral was part of the advent of Gothic architecture . The cathedral houses relics of St Cuthbert and Bede . The Norman castle was the residence of the Durham prince-bishops
The English Lake District Cumbria , England 54°28′26″N 3°4′56″W / 54.47389°N 3.08222°W / 54.47389 ; -3.08222 ( The English Lake District ) N/A 422 ; 2017 ; ii , v , vi Famous for its scenic landscape of mountains , lakes , houses , gardens and parks , the Lake District was celebrated through picturesque and romantic visual arts and literature from the 18th century on
Forth Bridge Edinburgh , Inchgarvie and Fife , Scotland 56°00′02″N 3°23′19″W / 56.000421°N 3.388726°W / 56.000421 ; -3.388726 ( Forth Bridge ) 1890 1485 ; 2015 ; i , iv The Forth Bridge is a cantilever railway bridge over the Firth of Forth in the east of Scotland , 9 miles ( 14 kilometres ) west of Edinburgh City Centre . It is considered an iconic structure and a symbol of Scotland . It was designed by the English engineers Sir John Fowler and Sir Benjamin Baker
Frontiers of the Roman Empire Northern England and southern Scotland 54°59′N 2°36′W / 54.99°N 2.60°W / 54.99 ; -2.60 ( Frontiers of the Roman Empire ) 2nd century 430 ; 1987 ( modified in 2005 and 2008 ) ; ii , iii , iv Hadrian 's Wall was built in 122 AD and the Antonine Wall was constructed in 142 AD to defend the Roman Empire from barbarians . The World Heritage Site was previously listed as Hadrian 's Wall alone , but was later expanded to include the Antonine Wall in Scotland and the barriers , walls and forts in modern Germany
Giant 's Causeway and Causeway Coast County Antrim , Northern Ireland 55°14′24″N 6°30′40″W / 55.240°N 6.511°W / 55.240 ; -6.511 ( Giant 's Causeway and Causeway Coast ) 60-50 million years ago 369 ; 1986 ; vii , viii The causeway is made up of 40,000 basalt columns projecting out of the sea . It was created by volcanic activity in the Tertiary period
Gorham 's Cave Complex East face of the Rock of Gibraltar , Gibraltar 36°07′13″N 5°20′31″W / 36.120397°N 5.342075°W / 36.120397 ; -5.342075 ( Gorham 's Cave ) 33-23 thousand years ago 1500 ; 2016 ; iii Comprising four natural sea caves , the complex is the last known site of Neanderthal inhabitation some 28,000 years ago . Evidences of occupation by modern humans are also present at the site
Gough and Inaccessible Islands Tristan da Cunha , Saint Helena , Ascension and Tristan da Cunha , South Atlantic Ocean 40°19′05″S 9°56′07″W / 40.3181°S 9.9353°W / -40.3181 ; -9.9353 ( Gough and Inaccessible Island ) N/A 740 ; 1995 ( modified in 2004 ) ; vii , x Together , the Gough and Inaccessible Islands preserve an ecosystem almost untouched by mankind , with many endemic species of plants and animals
Heart of Neolithic Orkney Orkney , Scotland 58°59′46″N 3°11′17″W / 58.996°N 3.188°W / 58.996 ; -3.188 ( Heart of Historic Orkney ) 3rd millennium BC 514 ; 1999 ; i , ii , iii , iv A collection of Neolithic sites with purposes ranging from occupation to ceremony . It includes the settlement of Skara Brae , the chambered tomb of Maes Howe and the stone circles of Stenness and Brodgar
Henderson Island Henderson Island , Pitcairn Islands , Pacific Ocean 24°21′S 128°19′W / 24.35°S 128.31°W / -24.35 ; -128.31 ( Henderson Island ) n/a 487 ; 1988 ; vii , x The island is an atoll in the south of the Pacific Ocean , the ecology of which has been almost untouched by man and its isolation illustrates the dynamics of evolution . There are ten plant and four animal species endemic to the island
Historic Town of St George and Related Fortifications , Bermuda St George , Bermuda 32°22′46″N 64°40′40″W / 32.379444°N 64.677778°W / 32.379444 ; -64.677778 ( St George ) 17th-20th centuries 983 ; 2000 ; iv Founded in 1612 , St George 's is the oldest English town in the New World and an example of planned urban settlements established in the New World in the 17th century by colonial powers . The fortifications illustrate defensive techniques developed through the 17th to 20th centuries
Ironbridge Gorge Ironbridge , Shropshire , England 52°37′34″N 2°29′10″W / 52.626°N 2.486°W / 52.626 ; -2.486 ( Ironbridge Gorge ) 18th century 371 ; 1986 ; i , ii , iv , vi Ironbridge Gorge contains mines , factories , workers ' housing , and the transport infrastructure that was created in the gorge during the Industrial Revolution . The development of coke production in the area helped start the Industrial Revolution . The Iron Bridge was the world 's first bridge built from iron and was architecturally and technologically influential
Jodrell Bank Observatory Cheshire , England 53°14.5′N 2°18.7′W / 53.2417°N 2.3117°W / 53.2417 ; -2.3117 ( Jodrell Bank Observatory ) 1945 1594 ; 2019 ; i , ii , iv , vi N/A