Under the scorching sun, Thai archaeologist Tanachaya Tiandee clambers through ruined pagodas in the ancient town of Si Thep, trying to unlock their mysteries -- a task made harder because parts of the puzzle are missing thanks to decades of looting. A prayer garland next to the 6th-9th Century B.C Dharmachakra artifact at the Si Thep historical site in Thailand's Phetchabun province. (AFP) Thailand has a rich collection of historical sites, but foreign looting has stripped many of them, leaving