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

This top-secret nuclear bunker hidden in a Bosnian mountain has been converted to a modern art exhibition space.

Once the fallout shelter of a dictator, this sprawling bunker is now a combined history museum and contemporary art gallery.

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

A museum dedicated to secret surveillance.

In the heart of Tirana, this underground nuclear bunker has been transformed into a museum.

A sculpture of the iconic East German car on four legs is a tribute to those who traveled to Prague seeking asylum.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

This former insane asylum now holds a pathological anatomy museum.

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

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

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

Vienna's underworld of tunnels and subterranean rivers made an iconic appearance in a 1949 Orson Welles film.