If there's one attraction all visitors must tour during a visit to Siem Reap, it is Angkor Wat. As one of Asia's most popular UNESCO World Heritage Sites, Angkor Wat is an awe-inspiring temple located in a vast expanse known as Angkor Archaeological Park. Built from the 9th century to the 14th century, Angkor Wat is not a single compound but a collection of temples occupying what was once the administrative capital of the Khmer Empire. In addition to the stunning architectural features of Angkor Wat, what's most impressive about this famous temple is its bas reliefs, which document tales from Hindu mythology.