Ta Prohm of Angkor in Cambodia, former heart of the Khmer Empire
Angkor of Cambodia was the heart of the Khmer Empire for about 550 years (9th to 15th centuries) before overpopulation and environmental degradation lead to its abandonment. At its peak, the city spawled over an area the size of Los Angeles and supported more than a million people. The picture above shows Ta Prohm, a buddhist monastic complex where some of the original vegetation has been left uncleared by archaeologists.
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