Wat Phimai Khmer Temple Historical Park
Wat Phi Mai is a Khmer temple in the city of Phi Mai (near Nakon Ratchasima). It is one of the most important Khmer temples of Thailand.
It was reconstructed from ruins by the French and Thai scientists in the 1960's and made into a national park and heritage site.
You can find more information in this Wikipedia article: en.wikipedia.org/wiki/Phimai_historical_park