This ancient city is located about 110 km from Phetchabun township. The city dates back to the Dvaravati period during the 6th-8th centuries. It was later part of the Khmer Empire in the 10th century. The inner part of the city was designed by Mon architects, with the later outer part of the city was added by the Khmers. The city covers an area 4 km by 1.5 km and is one of the largest archaeological sites in Thailand.
Work is now under way to excavate and restore the ruined temples.