Near the former site of numerous witch burnings, this lavish Edinburgh mainstay pays homage to Scotland's brutal history.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

Built in 1512, the oldest cathedral in the Americas.

An eccentric German artist built this weird and wondrous castle packed with shocking sculptures and alien art.

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

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.

Sprawled across the Great Hall ceiling are various constellations and images relating to the zodiac.

The world’s first museum dedicated to the history of childhood opened in Edinburgh in 1955.

This otherwise ordinary close on the Royal Mile constituted the end of the world for Edinburgh’s poorest residents.

This allegedly haunted 16th-century tower house-turned-museum exhibits thousands of spectacular objects.

The taxidermy remains of the first mammal ever cloned from an adult cell are on display in Edinburgh.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Former hunting lodge of a duke who was an avid collector of impressionist works.

An immersive projection art installation uses sound, scale, and light to take visitors inside classic works of art.

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

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

France's most famous cemetery, with some of its most curious tombs.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

The vast, legendary catacombs hold secrets much stranger than stacked bones.