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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Megaliths tagged “porphyry”

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🇬🇧 United Kingdom · Megalith

Swinside Stone Circle (Sunkenkirk)

Late Neolithic · Late Neolithic Cumbria (Langdale axe trade area)

55-stone porphyritic circle (28.6 m) above Duddon estuary — best preserved in North-West England.