Wat Phou, also spelled Vat Phou or Wat Phu, is an ancient Khmer temple complex located at the base of Mount Phu Kao in Champasak Province, southern Laos. It is a UNESCO World Heritage site, historically associated with the Khmer Empire, which was centered in what is now Cambodia. Wat Phou is considered one of the last great temple complexes built during the empire's zenith. The site spans over 10 kilometers and comprises palaces, temples, and shrines that pay homage to the Hindu god Shiva. Despite its Hindu origins, the site displays a blend of Hindu and Buddhist iconography, reflective of the region's religious transition over the centuries. This architectural gem dates back to the 5th century, though the surviving structures are mainly from the 11th to 13th centuries. Visitors are greeted by a grand entrance, ancient causeways, and intricate stone carvings showcasing the skill of the Khmer builders. The complex is well-known for its serene atmosphere and the stunning views it offers of the surrounding landscape. As visitors ascend the temple mountain, they encounter various structures including a sanctuary, libraries, and courtyards, culminating in an impressive shrine at the top.