The vast, legendary catacombs hold secrets much stranger than stacked bones.

A church of bones, decorated with 40,000 human skeletons.

This former insane asylum now holds a pathological anatomy museum.

Macabre astrological automaton clock dating to the late 1400s.

Mummified monks and the accidentally interred, in a 17th-century crypt.

A collection of anatomical samples from one of the first anthropologists to suggest that humans reached North America by crossing the Bering Strait.