This ex-prison dates back to the Middle Ages.

In the center of Wrocław's old meat market stands a somber tribute to the city's livestock.

The silly symbol for an underground protest group is now scattered around the city.

A collection of old neon signs from all over Poland line a secluded courtyard.

Ruins of a German Castle on top of a towering stone pillar.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Amsterdam's former hotspot for public executions and dissections.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

A public urinal so pretty, it was declared a national monument.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

This intricately carved and hilariously huge bed was such a famous symbol both Shakespeare and Byron used it in their writing.

The fences outside some of South London's estates are made from recycled World War II stretchers.

A quirky statue in Bermondsey made by 100 public participants with goggles, chisels, and mallets.

This one has sailed five times as far as Sir Francis Drake's famous ship.

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

A Jenga-style cylindrical tower of books that appears to go on forever.

What looks like a suicide in progress is actually a statue of Sigmund Freud.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

On a teardrop-shaped island in the Danube, the ruins of a convent and the final resting place of a saint.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

A famous big wave from Japan serves as a tribute to the victims of the disastrous Elbe flood.

Silent memorial, using bone conduction to take people back to the Dresden Bombing of 1945.

This Dresden church was purposely rebuilt Protestant after being demolished in World War II.