Prasat Preah Vihear comprises the ruins of an old Khmer sanctuary, behind the disputed 4.6 sq km area between Thailand and cambodia. - See more at: http://www.adventureinthailand.com/locations/northeastern-thailand/si-sa-ket/khao-phra-wihan-national-park-sisaket/#sthash.CvzkkZz0.dpuf