Built in the first half of the sixth century and believed to be the final resting place of the legendary Emperor Keitai, this massive keyhole-shaped burial mound (kofun) is the only grave of its kind in Japan that can be entered by the public.
The front chamber, where rituals were held to honour the interred, hosts some 200 terracotta clay figures (haniwa) depicting humans, animals and even buildings. Visitors can learn more about the history and culture of ancient Japan at the adjacent Imashirozuka Museum.