Some 130 kilometres south of Phetchabun, on Highway Number 21, is the Si Thep Historical Park. Si Thep is an ancient town where many architectural structures still remain to indicate its past prosperity during the 11th – 18th Buddhist century. It was once the centre of contact between the Dvarravati Kingdom in the central plain basin and the Khmer Kingdom in the Northeast. A twin- city, there were over one hundred ancient sites all built with bricks and laterite, most of them have since crumbled.[5] There are also remains of several ponds spread out all over the area.[3] Most of the ancient relics recovered are parts of architectural nature such as elaborate lintels, plastered designs and sema stone and human skeletons still are adorned with ornamental pieces.[8] In 2000, it got a Thailand Tourism Award for guaranteeing welfare of culture and ancient buildings