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800 years ago the largest city on Earth wasn't in Europe or China. It was hidden in a jungle, and nearly a million people lived there. The Khmer Empire built it by mastering water colossal reservoirs and canals that captured the monsoon to feed a million mouths at its heart. Angkor Wat, the largest religious monument on the planet. Then the water turned decades of drought, then floods too violent for their aging canals. The system collapsed, war came, the city was abandoned, and the jungles swallowed it whole. For centuries no one knew its true size until lasers scanned through the trees and revealed a lost city far bigger than anyone imagined. Full documentary on our channel follow for the history they Never taught you.

800 years ago the largest city on Earth wasn't in Europe or China. It was hidden in a jungle, and nearly a million people lived there. The Khmer Empire built i…