The 40,000 to 70,000 skeletons within Sedlec Ossuary (aka Kostnice Ossuary Beinhaus) in the Czech Republic welcome you, quite literally, with open arms.

Known to most as “the Bone Church,” it displays some of the world’s more macabre art. In addition to a splendid bone chandelier composed of almost every bone in a human body, the ossuary displays two large bone chalices, four baroque bone candelabras, six enormous bone pyramids, two bone monstrances (a vessel used to display the Eucharistic host), a family crest in (you guessed it) bone, and skull candle holders. Festively looping chains of bone are hung throughout like crepe paper at a birthday party.

Sedlec Ossuary has a long history, beginning in the 13th century when the Abbot of the Sedlec Monastery (Abbot Henry) brought a handful of earth back from a journey to the Grave of the Lord in Jerusalem. He scattered this “holy soil” across the Sedlec cemetery, securing its place as one of the most desired burial sites for people all over Bohemia and the surrounding countries. Everyone wanted to be buried in that handful of the Holy Land and more than 30,000 were. But it wasn’t long before there simply wasn’t enough room for everyone to rest in peace, and the bodies were moved to a crypt to make room for the newly dead.

In 1870, a local woodcarver, František Rint was employed for the dark task of artistically arranging the thousands of bones. Rint came up with the Bone Church’s stunning chandelier, as well as the amazing Schwarzenberg coat of arms, which includes a raven pecking at the severed head of a Turk–all made of human bone. Rint was responsible for bleaching all of the bones in the ossuary in order to give the room a uniform look. His artist’s signature is still on the wall today–naturally, in his medium of choice, bone.