Wat Prasatwas built in the reign of King Narai the Great (of the late Ayutthaya period). The ubosot possesses sophisticated craftsmanship: the upper part features a divine god riding garuda, the finial is decorated in Mon style while a royal lion is depicted beside the finial. The sampan-shaped ubosot base used no drilling during the construction. The reason behind the unusual shape of the building is that the shape would easily allow cool air to replace heat when it rises. The mural paintings here from the late Ayutthaya period are the works of advanced artists of the province. They are currently the oldest paintings of Nonthaburi.