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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Hydraulic works tagged “quarry”

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🇪🇬 Egypt · Hydraulic works

Wadi el-Hudi Amethyst Mines

Old to New Kingdom (2600–1100 BCE; peak 2050–1650 BCE) · Egyptian (Middle Kingdom)

Middle Kingdom amethyst mining landscape with 14 quarries and fortified miners' fort.