It is next to the King Naresuan shrine to Sa Kaeo. It is a place of prehistoric art collections and objects of neighboring countries.

From the intentions of Phra Kru Uthai Thammanee (Seng Sukototo), the former Abbot of Wat Pa Mafai, to preserve ancient objects and collectibles that villagers bring to creat valuable museum which stores precious antiques and also the source of learning foe the next generation. This museum was founded in 1993. The exhibition building consists of 2 floors. The first floor is a public space, office and museum exhibits displaying the story about the famous monks of Prachin Buri, Buddha image, acred objects, earthenware, Thai or Chinese porcelain, bracelet, pottery, Thai coins, and neighboring country's coins. Second floor shows Phra Siam Dhevatira which is granted the royal permission from His Majesty King Bhumibol Adulyade. When it was done, it appeared that the response was too good to be expected from the devotees, making Phra Siam Dhevatira a rare and highly valued monk. In the same area, there is also an exhibition of porcelain vases, the traditional pattern of Chinese-style porcelain tiles with half size of a real person. Open daily except public holidays 08.30-16.00.