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, partially excavated spillways

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Spillways Verified Partially excavated Clear all

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🇮🇷 Iran · Hydraulic works

Kebar Dam South Spillway Extension (Kebar Secondary Spill)

Mongol Ikhanid–early Timurid (1300–1400 CE) original; Safavid extension 1680 · Ilkhanid–Safavid

South-bank secondary spillway extension 0.4 km south of main Kebar arch dam (26 m high, 55 m crest, oldest surviving arch dam c.1300, already in DB as kebar-dam-qom-iran) at 1,520 m.