Due to the limited land area of Harstadt, the bones of the deceased person will be removed from the grave after 10 years of burial and placed in the skeleton hall in the cave on the mountain, and the names and skulls of the years of life and death will be stacked together to form a human bone chamber, and a total of 1,200 skulls will be piled up in the human bone hall. 610 of them were also painted.