Berlin's old airport.

A fascinating insight into daily life in the Eastern Bloc.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

On rare days, this abandoned castle's gatekeepers open its doors, revealing the eye-popping splendor hidden inside.

Medieval torture techniques with a modern conscience.

This 16th-century monastery has been turned into a surrealist architecture compound.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

The studio built by fascists in the hopes of "reviving the film industry" with the occasional propaganda film opportunity thrown in.

An ancient capital city that dates back 3,000 years and harbors many surprises.

Water and windows define this defensive Italian well.

Renaissance hospital featuring a rotating door into which unwanted babies were dropped.

Metro station with a claim to rock n' roll fame.

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

These "anatomical machines" are only one of the many strange items in this Italian crypt.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

Northern Ireland's Brobdingnagian stepping stones.

France's most famous cemetery, with some of its most curious tombs.