Budapest's Communist-era statues, banished to the suburbs.

A Hungarian pharmacy museum with a box full of mummy powder.

A museum in the childhood house of a medical pioneer.

The abandoned "Red Star Train Graveyard" is the final rusting place for precious artifacts of train history.

This off-beat, quirky communism-themed bar isn't afraid to poke fun at its history.

Once the home of a hermetic monk, this cave now houses a small church.

Museum dedicated to the terror regimes of Hungary.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

A museum dedicated to the classic Italian scooter in the heart of Serbia.

A museum dedicated to the former country.

Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

A network of hundreds of interconnected wineries in caves hides under the town center.

Now a pile of ruins and rubble, this was a lovely mountain town as recently as 1960.

A micro-communist utopia in Spain with no police, no mortgages and full employment.

The hidden ruins of an old hydroelectric plant reclaimed by nature.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

Visit a surreal landscape so otherworldly NASA actually used it to train the Apollo 17 crew.

A once grand hotel now sits eerily abandoned in the Catalan countryside outside Barcelona.

Cursed swimming pool left abandoned is now a favorite of filmmakers and ghost hunters.

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

A completely underwater art museum sends a stark message about humans' impact on the environment.