People have been living in the cave houses on this Italian hillside since the Neolithic era.

The first modernist church in Europe.

The housing complex served as an anti-fascist fortress during the Austrian Civil War.

This grand manse has been transformed into a museum devoted to one of the founders of Fantastic Realism.

The Habsburgs' royal collections of art and wonders.

Baroque celebration of the end of the Great Plague of Vienna.

A spherical "micro-nation" in the heart of Vienna.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

Rome's first modern graffito is all that is left of a peaceful protest from the 1970s.

Also known as the Square Colosseum, this building is a prime example of fascist-era rationalist architecture.

Gods clash with machines in a power plant regenerated as a museum.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

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

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

The yawning maw of this pagan visage is said to bite off the hands of liars.

Dug as a secret royal escape route, the tunnel became a wartime bomb shelter and dumping ground for vintage cars.

At first glance, this area seems like just another city park, but the lush landscape hides a dark past.

A memorial to the beloved brown bear that served in the Polish army during World War II.

This sprawling concrete suburb of Kraków was designed by the Soviet Union as the model proletarian city.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

The unsettling remnants of a torn down movie set lies nearby the ruined location of the actual Płaszów Labor Camp.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.