🇬🇧 United Kingdom · Megalith
Carreg Samson Dolmen
Early Neolithic (c.3800–3600 BCE) · Western Neolithic (Pembrokeshire)
Cliff-top portal dolmen near Abercastle harbour — massive capstone (4.7 m) on three orthostats with sea backdrop.
🇬🇧 United Kingdom · Megalith
Coetan Arthur at St Davids Head
Early Neolithic (c.3800–3600 BCE) · Western Neolithic (Pembrokeshire)
Headland portal dolmen (capstone 5 x 3 m) on St Davids Head cliff overlooking Whitesands Bay — Neolithic coastal tomb.
🇬🇧 United Kingdom · Megalith
Bodowyr Burial Chamber
Early Neolithic (c.3800–3200 BCE) · Neolithic Anglesey (Irish Sea province)
Anglesey portal dolmen with wedge capstone on five stones — small Neolithic tomb in farmland south of Gaerwen.
🇬🇧 United Kingdom · Megalith
Presaddfed Burial Chamber
Early Neolithic (c.3800–3600 BCE) · Neolithic Anglesey
Twin Neolithic chamber tombs in single long cairn near Presaddfed — west chamber with 5 m capstone best preserved.
🇬🇧 United Kingdom · Megalith
Lligwy Burial Chamber
Early–Middle Neolithic (c.4000–3500 BCE) · Neolithic Anglesey (passage grave tradition)
Eastern Anglesey portal dolmen with colossal 25-tonne capstone (6.5 x 5.5 m) — one of Wales's heaviest.
🇬🇧 United Kingdom · Megalith
Arthur's Stone, Gower (Maen Cetti)
Early Neolithic to Early Bronze Age · Severn-Cotswold / Gower Neolithic
Gower's 40-tonne conglomerate portal dolmen on Cefn Bryn ridge — largest capstone in Wales, split 1693.
🇬🇧 United Kingdom · Megalith
Trethevy Quoit
Early Neolithic · East Cornwall Early Neolithic
East Cornwall's tallest quoit — 2.4 m uprights supporting capstone 3 m high with internal divider and rear window.
🇬🇧 United Kingdom · Megalith
Dyffryn Ardudwy Burial Chamber
Early to Middle Neolithic · Irish Sea Neolithic
Double portal dolmen in Snowdonia foothills with two capstones sharing a mound near Cardigan Bay.