The Phimai Historical Park (Thai: ปราสาทหินพิมาย) located in the town of Phimai, Nakhon Ratchasima province hosts one of the most important Khmer temples of Thailand.The temple is believed to be build on the ends of an ancient Khmer highway from Angkor, nowadays Siem Reap in Cambodia, leading to the Khorat plateau.
The French geographer Etienne Aymonier was the first one to make an inventory of the temple in 1901. Later Phimai became a Historical Park, managed by the Fine Arts Department of Thailand. The Park was opened by Princess Maha Chakri Sirindhorn on April 12, 1989.
To reach Prasat Hin Phimai from the city of Khorat, head north along Highway 2 for 50 kilometers. Turn right and follow a sign to the Phimai Historical Park. 10 kilometers further down the Highway 206, you'll arrive at the town. From Khon Kaen it's about 120 kilometers south on Highway 2, take a left turn and follow Highway 206 until you reach Phimai town.