The spine-tingling Sedlec Ossuary in the Czech Republic is estimated to hold the remains of between 40,000 and 70,000 people, many of whom died in the plague in 1318 and during the Hussite Wars in the 15th century. 

Known as the ‘Skull Church,’ the macabre building contains bodies that have been dismembered, de-fleshed and reassembled into decorative features including a bone chandelier and chalices and even a family crest constructed from human remains.