Bored potato-guarding Nazis etched their thoughts onto a brick storage building in Copenhagen's Meatpacking District.

A museum filled with tiny, adorable versions of the mighty Royal Danish Navy.

Part of a secret 1970s nuclear defense program is now open to the public.

This open-air museum was originally a World War II testing ground for German missiles and rockets.

The NASA scientists behind Apollo 11 started out developing Nazi weapons at this abandoned German rocket factory.

This now-defunct synthetic fuel plant was once a major cog in the Nazi war machine.

An abandoned lighthouse awaits its destiny: being buried under shifting sand.

Hitler's bleak vision of relaxation still stands as a mostly abandoned 10,000-room resort complex.

The Netherlands' first car tunnel has an unusually rectangular shape.

Now abandoned, the world's first torpedo factory is crumbling into the sea.

This Croatian computer club features such gaming relics as the infamous Virtual Boy and an 8-bit Pacman machine.

This truly palatial work of Communist-era architecture now sits crumbling on a Croatian beach.

The only gulag ever to exist in socialist Yugoslavia.

Henry Ford's failed rubber plantation in the middle of the Amazon rain forest.