Constructed in the early 12th century (between 1113 and 1150) Angkor Wat is the largest religious monument in the world.
Angkor Wat is the primary reason that more than 50% of international tourists visit Cambodia. Cambodians are proud of their ancient monument and put it on the Cambodian flag in 1850.

The Angkor ruins stretch over more than 248 square miles (400 square kilometers).
The sandstone used to construct Cambodia's national monument, at least 5 million tons worth, had to be carried from a quarry 25 miles away.