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

Inside this Krakow church, an explosion of psychedelic color.

Macabre astrological automaton clock dating to the late 1400s.

This automated sculpture of two men peeing will spell out text messages with their micturition.

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

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Dedicated to the European Sinti and Roma peoples murdered during the Holocaust.

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

This French chateau is home to the world’s largest private collection of fighter jets.

A Swiss board game museum housed inside a picture-perfect castle.

Unable to build support structures on glaciers, the engineers for this tramway were forced to design a unique system.

An Orthodox church built by the Royal Family for the Russian community exiled to the French Riviera.

Museum celebrating the ocean, with the largest wunderkammer dedicated to sea exploration.

The celebrated eyesore created by starry-eyed sweethearts.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

Nestled amid the peaks and lochs of the Scottish Highlands, this inn and pub has played host to outlaws and ghosts.

The oldest house in Glasgow is now a museum dedicated to the city's medieval history.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

A six-ton wedding present for the King of the Scots.

This ancient castle has been abandoned since the Edwardian conquest of Wales.

A former fisherman's hut deemed too small for habitation is now a delightful tourist draw.

Only a few pieces remain of the structure that carried people and goods across the Thames for some 600 years.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

An important landmark in the history of algebraic logic.