Sedlec Ossuary is a small Roman Catholic church in the town of Kutna Hora, Czech Republic. It is decorated with human bones and skulls. It contains the bones of between 40,000 and 70,000 people. They made a huge chandelier, a coat of arms and a lot of decorations on the walls. There are also 4 piles, one in each corner, of bones and skulls. They had to unearth mass graves for the building of a Gothic church in the 15th century and the lower level was built to be used as an ossuary to store those extra bones.