🇬🇧 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
Midhowe Chambered Cairn
Early–Middle Neolithic (c.3500 BCE) · Orkney-Cromarty Neolithic
23 m stalled chambered cairn — Orkney's longest — with 12 compartments and remains of 25 Neolithic burials.