A house of bones — but nobody is quite sure to whom they belong.

A museum of alchemy and a basement laboratory all housed in an ancient building in a Gothic tower.

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

A crucified and bearded female saint.

Macabre astrological automaton clock dating to the late 1400s.

A saintly relic hidden in a Prague church basement.

This 1000 year old relic-filled cave monastery and UNESCO World Heritage Site also hosts an amazing micro-miniature museum.

Since 1874, this macabre collection has developed into a museum devoted to Scotland Yard's mementos of dastardly deeds.

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

Indents in the pavement are all that remain from a grisly death machine in Paris.