An atlas of Earth’s mysterious places — megaliths, pyramids, lost and sunken cities — with the evidence shown plainly: what is verified, what is contested, and what is still unknown.

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Excavated portal dolmens in United Kingdom · Mysteria

The catalogue

Excavated portal dolmens in United Kingdom

3 places to sift through. Narrow by kind, country, period or how firmly each one is established — contested and pseudoarchaeological claims are labelled here, never hidden.

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Verified9 Widely accepted0 Contested0 Hypothetical0 Unverified0 Pseudoarchaeology0

3 places

🇬🇧 United Kingdom · Megalith

Trethevy Quoit Cornwall

Neolithic · Cornish Neolithic

Trethevy Quoit Cornwall at Cornwall, United Kingdom is a Neolithic megalithic of the Cornish Neolithic tradition, built c. 3700 BCE for 10.5 tonne capstone with hole.

✓Verified

🇬🇧 United Kingdom · Megalith

Pentre Ifan

Early Neolithic · Preseli Early Neolithic

Wales' largest portal dolmen with 16-tonne capstone on three 2.4 m orthostats.

✓Verified

🇬🇧 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.