Located about 70 km to the North of Siem Reap city, at the top of a cluster of hills is Peung Tanon (Standing Stones). It’s a stunning, natural geological wonder consisting of a series of huge sandstone formations dotted around the hilltop site. Nobody seems to know much about them at all; how they formed and their history remains a mystery. When asked, a guide at the site suggested the site could once have been an ocean bed and the Khmer Rouge may have used it during the Pol Pot regime. To be honest, though this sounded like guesswork.