Ossuaries are not uncommon in Europe. An ossuary is by definition a place for bones. It can mean a chest/container of some kind or a room, but what makes some ossuaries spooky places to visit on Halloween is that they are no ordinary places of storage. Some ossuaries, like the one in Sedlec, are bizarre and macabre works of art where the bones of many thousands of people are displayed and are even used in the construction of the chapel, church or room. You’ll find things like bone chandeliers, garlands of skulls and even seating made of bones. Trés creepy indeed!