The walls and streets of the ancient city are peppered with penises.

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

This Florida sinkhole hides a rainforest-like micro-environment in its depths.

A unique seaside cave where Aleister Crowley faked his own death.

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

Genoa's collection of over 4 million zoological, botanical, and geological specimens from around the world.

After the famous composer died in Paris, his sister snuck his heart out of the country to honor his wish that it be buried in their native country.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

Five candy-colored villages on the Italian Riviera.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

This modest marker near Notre Dame identifies the very center of Paris.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

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

Macabre astrological automaton clock dating to the late 1400s.

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

Now an entertainment complex, the Lingotto building was once an avant-garde auto factory with a test track on the roof.

Real bones which are said to have belonged to a Polish dragon.

The world's most active stratovolcano is almost always erupting.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.