Wat Phou, Laos. The ruined Khmer temple of Wat Phou (Temple of the Mountain) in Champasak stands on the site of a Hindu sanctuary dating from the 5th century. The Khmer temple ruins now on the site were built was between the 7th and the 13th centuries. Wat Phou is an important example of early classical Khmer architecture and predates Cambodia’s Angkor Wat. In the mid-13th century Buddhism replaced Hinduism in the temple. Elements of both religions can be seen in the ruins. Wat Phou is a UNESCO World Heritage Site.