The Mozu-Furuichi Kofun Group has been designated as a UNESCO World Heritage Site. The burial mounds, created some 1600 years ago, were made for members of the elite and some are even considered to be the burial sites of past Emperors and their families. Research has unveiled findings about who is really buried in the tombs and why they are preserved so well. The program digs into the mystery of Japan's ancient burial mounds.