Image of the UNESCO's World Heritage Site of Angkor Wat. Angkor Wat is a temple complex near Siem Reap, Cambodia, built for the king Suryavarman II in the early 12th century as his state temple and capital city. As the best-preserved temple at the site, it is the only one to have remained a significant religious centre since its foundation - first Hindu, dedicated to the god Vishnu, then Buddhist. It is the world's largest religious building. The temple is at the top of the high classical style of Khmer architecture. It has become a symbol of Cambodia, appearing on its national flag, and it is the country's prime attraction for visitors.