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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Verified, unexcavated portal dolmens

2 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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Verified16 Widely accepted1 Contested0 Hypothetical0 Unverified0 Pseudoarchaeology0

2 places

Portal dolmens Verified Unexcavated Clear all

✓Verified

🇬🇧 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.

✓Verified

🇮🇪 Ireland · Megalith

Kilclooney More Dolmen

Early Neolithic (3800–3600 BCE) · Northwest Irish Neolithic

Kilclooney More portal dolmen on the Donegal coast north of Ardara, a dramatic tripod dolmen with tilted capstone on slender portal orthostats overlooking Donegal Bay; intact burial chamber never…