Kofun

Kofuns are giant Japanese gravemounds which are usually shaped like keyholes. Their size can vary from a few meters to the Daisen Kofun which is the biggest grave in the world covering an area of 460,000m². Many of these date back to the 3rd century, but with few exceptions, the government doesn’t allow excavation. These are mostly off limits because no one wants to accept that the Japanese imperial family probably came from Korea in the 3rd through 6th centuries CE. The Japanese government actually has people in little guardhouses by the biggest Kofun all day, just to make sure no one climbs them.