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As part of measured steps toward greater openness, a department of the Imperial Household Agency on Friday guided academics and reporters around a hitherto off-limits megalithic burial mound near Osaka Bay.

Dating from the late fifth century, Tannowa Nisanzai Kofun is an earth mound surrounded by a moat and measuring 170 meters long. Seen from the air, it has the shape of a keyhole.

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