Hachimanyama Kofun(Burial mound)

The Hachimanyama Kofun is a large Kofun period burial mound in the Yamawaki neighborhood of Shōwa Ward in the city of Nagoya, Aichi Prefecture. Dating from the mid-fifth century, it is the largest circular kofun in the Tōkai region of Japan. The tumulus was designated as a National Historic Site in 1931.

Source: Wikipedia