Koumorizuka Tumulus

This keyhole-shaped tumulus was built in the 6th century and is about 100m long, with a huge horizontal stone chamber on the same scale as the Ishibutai Tumulus in Nara. In the center of the stone chamber is a house-shaped sarcophagus carved out of a limestone monolith. On February 15, 1967, it was designated as a national historic site.