This impressive collection of skulls and bones was gathered by an ex-zookeeper who took advantage of a pig plague.

A marble Lucifer hides behind the pulpit of this Gothic cathedral.

This former Nazi castle was built as a school to train what would have been the future of the Third Reich.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

A former plague hospital turned medical museum.

First museum dedicated to the research and history of Epilepsy.

Medical history with an amazing, if frighting, collection of wax diseases on display.

A varied collection of brains in alcohol.

Unchanged for centuries, this medieval library keeps its books in chains.

The world's biggest pet store.

Take a stroll through the hellish grotesques of Hieronymus Bosch in this elaborate Netherlands church.

A statue honors the local legend that the devil helped build St. Mary's church after being tricked into thinking it was going to be a wine bar.

Ample proof that watery ends make for well-preserved, millenia-old mummies.

This beautifully designed star-shaped fort was the premier defense system of the late 1500s.

Remarkably preserved body discovered in a peat bog.

This East German military command bunker was ready for World War III.

Wax models of disease and deformity are on display at this German medical museum.

An ancient ossuary in Rouen.

Sacked by Vikings, blessed by William the Conqueror, dealt a fatal blow during the French Revolution—these ruins have seen it all.

Medical history museum featuring a lovely doctor's office from the 1800s.

A forensic lab dedicated to fighting crimes against wildlife.

Home to 10,000 medical specimens including the remains of Rudolf Virchow's extensive collection of pathological specimens.

Terrifying derelict military hospital once housed a recuperating Hitler.