| UPDATED: 16:12, Mon, Dec 14, 2020
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Daisenryo Kofun: Japan s keyhole shaped tombs explained Sign up to receive our rundown of the day s top stories direct to your inbox
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Distinctly shaped ancient burial grounds known as kofun are found all across Japan. Almost identical to the shape of a keyhole, the structures are ancient burial mounds built thousands of years ago. Kofun range from several metres to over 400m long, with the largest - the Daisen Kofun - having been attributed to Emperor Nintoku, in Sakai City, Osaka.