Underneath this small church are 15,000 bones, arranged by an obsessive academic.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

This hidden art nouveau gem was designed by an architect in search of a national style.

The anatomical-pathological collection of a man who changed surgery.

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

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

An Austrian house of bones filled with hundreds of intricately painted skulls.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

The final resting place for the remains of 143 Habsburg royalty.