Angkor Wat was once the largest pre-industrial city on Earth, home to over 1 million people in the 12th century. Built by the Khmer Empire in what is now Cambodia, the massive temple complex and surrounding city covered over 400 square kilometers—larger than modern-day Los Angeles. But in the 15th century, after the empire's decline, the city was abandoned. Over the next 400 years, the tropical jungle slowly reclaimed everything. Massive trees grew through temple walls. Roots wrapped around anci

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