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 places tagged “severan” in Egypt · Mysteria

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Verified places tagged “severan” in Egypt

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🇪🇬 Egypt

🇪🇬 Egypt · Hydraulic works

Mons Porphyrites — Imperial Porphyry Quarry

Roman Imperial (29 BCE–211 CE, active to 4th c) · Roman Imperial

Mons Porphyrites (Gebel Dokhan) is the only imperial porphyry quarry in Roman Empire (29–211 CE) producing purple porphyry for Diocletian and Hadrian pillars, sarcophagi and Pantheon.