Some of the greatest minds in the history of Hungarian art and science converged in this café.

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

Sitting beneath an unremarkable residential building is a museum devoted to classic Pinball.

A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

A museum in the childhood house of a medical pioneer.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

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

Terrifying derelict military hospital once housed a recuperating Hitler.

This decommissioned nuclear power plant offers tours of its Communist-era control room and reactor hall.

Retirement home for giant obsolete machines.

Beneath the impressive baroque cathedral that rises from the center of Berlin lies the largest collection of Prussian royals in the world.

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

A surreal museum of extraordinary industrial objects.

Puppet theater and museum holding a collection of more than 300.

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

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

Started as a kitchen garden, now the second largest botanical garden in the world.