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."The big picture like the building was discovered, but the artefacts which tell little details are missing, making a lot of stories untold about Si Thep," Tanachaya told AFP. "It's like a piece of puzzle was missing," she said.