This isn’t your typical church. You’ll freak when you see what this is made of.

IFL Science – It might sound like the ultimate Halloween party venue or some interior design by Skeletor, but the Sedlec Ossuary might just be the most bizarrely macabre place on Earth.

In the small Roman Catholic chapel in the Czech Republic, there’s a chandelier made of every bone in the human body. If that wasn’t morbid enough, the whole interior of the building is caked with the skeletal remains of between 40,000 and 70,000 people.

It started with a handful of dirt that a local abbot brought back from Jerusalem in the 13th century. After sprinkling it in the graveyard, a grave in the increasingly popular chapel became the must-have accessory for every corpse.

Read more: IFL Science