A miniature train-ride through Slovenia's largest cave system.

This abandoned Slovenian military barracks has become a punky-political art squat.

This massive subterranean fissure is known as the "underground Grand Canyon."

Time stands still at this serene burial ground in the center of Budapest.

A Hungarian pharmacy museum with a box full of mummy powder.

Once the home of a hermetic monk, this cave now houses a small church.

Museum dedicated to the terror regimes of Hungary.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

In 1830, cemetery workers in Cham unearthed a chamber housing thousands of skeletal remains from the 13th century, which can still be viewed today.

Visitors can explore the role of mysticism throughout the ages inside this interactive museum of magic.

When German-Iraqi relations broke down, this embassy was vacated post haste.

Terrifying derelict military hospital once housed a recuperating Hitler.

From toys to kettles to scientific instruments, this German museum celebrates the beauty of 20th century design.

A tree-like building perches on its trunk in the Steglitz neighborhood of Berlin.

"The most colorful grottoes of the world.

Skeletons dressed in extravagant 18th century royal costumes cavort in the aisles of this German basilica.

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

A fascinating insight into daily life in the Eastern Bloc.

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

A wunderkammer of mysterious objects and stories.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

The precise origins of this pink sandstone temple are unknown.

A small house sits between two huge rocks, with its back to the sea.