Structure built from the skulls of vanquished foes.

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

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

One of the oldest medical collections in Europe focusing on rare surgical instruments.

This small chapel is built of human bones and decorated with a golden skeleton.

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

The personal charnel house of Anton Bruckner.

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

Skeletons dressed in extravagant 18th century royal costumes cavort in the aisles of this German basilica.

Statue of a decomposing prince that once held his heart in its hand.

This modern French ossuary contains the jumbled bones of 130,000 WWI soldiers.

The largest catacomb system in the world.

Handsomely crafted representations of our round planet.

This former insane asylum now holds a pathological anatomy museum.

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

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

Europe's second largest ossuary wasn't discovered until 2001.

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

This "mathematical tower" was an observatory, early skyscraper, and place to reflect on all of nature and the cosmos.

Oldest Museum of the Netherlands is a true cabinet of curiosities.

Home to the "Rat King" of Nantes and other wonders of the natural world.

The Natural History Museum that time forgot.