Reposting from 2010. When visiting family of my wife in Sakhon Nakhon province we did also visit the Phra That Phu Phek ruins of a Hindu sanctuary from about the 11th - 12th century A.D. Build during the time of the Greater Khmer Kingdom that did reach that far into nowadays Thailand! It is located 37 km west of Sakhon Nakhon in the North-East of Thailand (Isaan). It is a 16 km drive from the Route 22 (leading to Sakhon Nakhon) and you can park your car halfway on the mountain next to a modern temple in the spirit of the old Khmer temple (have a look inside). From here a 490 steps stairs goes straight up to the top of the mountain where the ruins of the temple are. It is a heavy but rewarding climb all the way thru the jungle. All over North-East Thailand you can find remains of temples, hospitals & libraries build during the Greater Khmer Kingdom.