1. Angkor Wat's Hidden Megacity

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1000 years ago, the Khmer people in Cambodia built a kingdom that stretched a million square kilometers. Its capital was the lost jungle city of Angkor, once the largest on Earth. The lives of the people who lived there largely remains a mystery. But now an innovative scientific project is shedding new light on this metropolis. It might also reveal the reasons for Angkor's mysterious collapse.