In 1418, there were buried 30 thousand people, who died during a cholera epidemic and during the Hussite Wars in the first half of the 15th century. The maximum area of the cemetery reached 3, 5 hectares. Gradually, it was destroyed, so arriving bones piled in the first six pyramids of 10,000 bones. The modern form of storage has taken on the proposal of Karl Schwarzenberg in 1870.
Interior begins and ends with the altar chandelier, which consists of all the bones of the human skeleton. Just Ossuary - the largest in Europe - containing bone 40,000 people.