Another historical site in Korat that is rarely visited is the ancient city of Sema, near the modern city of Sung Noen, about 30K west of Korat. According to Wikipedia:
The city of Sema was built around the 12th Century:From archeological evidence it has been found that there were 2 ancient towns named Sema and Korakapura which currently are in Sung Noen district, 30 km west of present-day Khorat. In the years around 1656-1688 King Narai moved the city [Korat] to its current location.
Prasat Non Ku
Prasat Muang Khaek