Phra Prang Sam Yod consists of three interconnected laterite prangs (towers) aligned in a north-south axis, representing the distinctive Bayon style of Khmer art. Established during the reign of King Jayavarman VII, it was originally a Mahayana Buddhist site: the central tower housed a Nak Prok Buddha, the north tower Prajnaparamita, and the south tower Avalokiteshvara. The structure is adorned with intricate stucco designs, particularly on the pediments and lintels, where fragments of celestial figures and traditional floral motifs are still visible. During the reign of King Narai the Great, the site underwent restoration, and an open Thai-style vihara was added in front to accommodate Theravada Buddhist worship. Today, beyond its architectural beauty, Phra Prang Sam Yod is globally famous as the primary home of Lopburi's monkeys, attracting tourists to witness this unique coexistence.