Phra Prang Sam Yod is an ancient monument comprised of three interconnected laterite prangs, representing the Bayon style of Khmer art from the reign of King Jayavarman VII. Initially constructed as either a Hindu shrine or a Mahayana Buddhist temple, each prang symbolized the Trimurti or the Buddha and Bodhisattvas, depending on the beliefs of that era. A significant feature is the intricate stucco work decorating the pediments and door frames, showcasing the enduring craftsmanship of ancient artisans. During the reign of King Narai the Great, the site underwent restoration, and a vihara was erected in front to enshrine a Buddha image, in accordance with Theravada Buddhism. Currently, the site is globally recognized as the primary habitat for Lopburi's monkeys and acts as the central venue for the province's major festivals.