Angkor Wat was built in the early 12th century AD as a Hindu temple dedicated to Vishnu by Khmer King Suryavarman II. Its architecture represents Hindu cosmology and Mount Meru, the abode of Hindu gods. Later it became a Buddhist center under a king who adopted Buddhism. Key features include five towers representing Mount Meru's peaks, galleries symbolizing Hindu gods, and bas-reliefs depicting Hindu epics. Its architectural symbolism aimed to recreate heaven on earth and make religious beliefs more tangible.