A 400-year-old mummified arm dangles from the ceiling of St. James the Greater, serving as a warning to thieves.

This Prague museum collects brutalist relics and memories from the country's former Soviet rule.

This bar and museum are devoted to the controversial comic book work of Kája Saudek.

The last municipal pneumatic post system in the world was in operation for over 100 years, and may run again.

A mocking tribute to the past and modern leadership of Prague.

Monument to a suicide protesting the Soviet invasion.

Looming communist pillar with a Czech twist.

A collection of anatomical samples from one of the first anthropologists to suggest that humans reached North America by crossing the Bering Strait.

A saintly relic hidden in a Prague church basement.

It's always summer at the beach inside this former airship hangar.

Terrifying derelict military hospital once housed a recuperating Hitler.

The site of a concentration camp where inmates were made to take part in one of the largest counterfeiting operations in history is now hauntingly empty.

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

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

Come stay at a live-in art installation.

An eerie, derelict amusement park in Berlin.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

Floating swimming pool within a moored vessel.

Super-heavy Nazi architectural experiment.

The abandoned remains of this Victorian brewery hide crumbling bowling alleys and rusting industrial gear.

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

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

This World War II bunker now survives as a documentation of the Nazi regime and war crimes.

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