This former military installation was turned into a discipline center by the Taiwanese Navy.

A secret passageway from World War II is now a quirky pedestrian shortcut.

Hidden in the forest are the crumbling, graffiti-covered remains of the factory where most of Germany's explosives were produced during World War II.

Constructed by forced laborers, this submarine pen is now a museum and war memorial.

These abandoned Cold War-era bunkers are now a designated refuge for endangered bat species.

A ruined castle stands atop a hill surrounded by dragon lore.

This monument to those fallen in the World Wars is accompanied by a U-boat that Germany bought for a Deutsche Mark.

A crumbling bakery where forced laborers from the nearby concentration camp toiled to feed their fellow prisoners and Nazi soldiers.

Walk inside a half mile long crevice right outside the town of Garmisch Partenkirchen.

An abandoned train station in Munich constructed for the 1972 Olympic games.

From Nazi chemicals to the CIA, this architectural marvel has played a fascinating role in German history.

The Bauhaus-style former industrial complex is considered the world's most beautiful coal mine.

A former Nazi lookout tower with a magnificent view of the Rhineland.

One of the most easily accessible examples of the rare 1960s UFO houses.

The ruins of an abandoned crematorium haunt an eerie deserted German cemetery.

There are two dozen tanks just sitting in an open field in Lower Saxony.

The entrance to this Frankfurt subway station looks like an old tram car crashed into the concrete sidewalk.

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

The ruined remains of the airport Claus von Stauffenberg departed in his failed attempt to kill Adolf Hitler.

A strange rock formation with numerous legends trying to explain it.

Retirement home for giant obsolete machines.

Remnants of an exploded schooner and wrecked submarines form a breakwater.

This ancient ruined monastery has been destroyed by fire so many times that it seems like God hates it.

The industrial monstrosity known as Bagger 258 is a colossal mining machine built in the DDR - but now left for dead in a German field.