Angkor Wat, the massive temple complex in Cambodia, is shrouded in many mysteries. Some of the most intriguing include:
1. Construction techniques: The temple was built using huge sandstone blocks, some of which weigh up to 1.5 tons.
2. Purpose: Some experts believe that the temple was also an astronomical observatory.
3. Abandonment: It is still not clear why the Khmer civilization abandoned Angkor Wat in the 15th century.

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