Prasat Tamnak Sai
Located at Ban Tamnak Sai, Tambon Bak Dong, Tamnak Sai Khmer Ruins has a single stupa on sandstone base. The brick stupa has rectangular shape and one real door at the east while the other three are fault doors with carved door frame on the brick. Two carved guardian lions are watching the gate. The front door has frame made of sandstone. The door once was decorated with carved lintel depicting the God Narai lying on naga, with Laksami sitting at his feet, and Brahma rising from his navel. Both side of Brahma are hermit and a person in the frame. Now such lintel is kept in Phimai National Museum.