Khao Kha is a small hill in Tambon Sao Phao, Amphoe Sichon where a 1,500 – year old city has been discovered. To get there, travel along Highway No. 401, then turn right at Km. 99, and drive on for another 5 kms. The remains of a laterite shrine are found on the hilltop. There are fragments of architectural ruins left scattered around the area.