This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Tucked away in a Prague park, a statue beloved by romantics honors a poet so nice they buried him twice.

Increasingly decayed figures stand as a powerful reminder of the human costs of Czech Communism.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

This walkway is so narrow it needs its own light to stop pedestrian traffic jams.

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

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

Also known as the Temple of Poseidon, this is one of the best-preserved Greek temples in the world.

The only visible remains of this ancient Greek underground temple is its roof protruding from the earth.

According to the legend, this structure was built in a single night with the help of the devil.

Erotic art covers the walls of the largest ancient pleasure palace.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

This medieval city gate is now a blend of the past and the modern world.

Every day is like Christmas on this street where the traditional Neapolitan nativity scene comes to life.

A special area of the National Archaeological Museum of Naples is located inside a metro station.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

This breathtaking monastery was established by Saint Benedict himself 1,500 years ago.

This monastery set over a holy cave contains the oldest known painting of Saint Francis of Assisi.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

This ancient market is often referred to as the oldest shopping mall in the world.