SAKAI, JAPAN—Five new boreholes for piers thought to have supported a massive bridge have been found at the Nisanzai Kofun burial mound in Japan’s Osaka Prefecture. The bridge is estimated to have been nearly 40 feet wide, 150 feet long, and aligned with the center of the keyhole-shaped mound. “It seems likely that people stood by on both sides of the bridge while a temporary casket for the body was taken into the tomb. It gives us clues as to how ancient burial rites were performed at giant burial mounds,” Taichiro Shiraishi of the Chikatsu Asuka Museum told The Asahi Shimbun. The bridge, thought to have been used in the late fifth century, would have been torn down after the ceremony. “It is unlikely that a structure of this kind was unique to this burial mound. If they get the chance, we hope researchers will investigate other large tombs as well,” Shiraishi said. To read more about archaeology and Japanese history, go to "Khubilai Khan Fleet."