Angkor Wat, Cambodia

Built by King Suryavarman II in the early 12th century, Angkor Wat is the world's largest religious monument, spanning 162.6 hectares in Siem Reap, Cambodia. Originally a Hindu temple dedicated to Vishnu, it gradually transformed into a Buddhist site. A UNESCO World Heritage Site since 1992, it draws over 2.6 million visitors annually and appears on Cambodia's national flag.