This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

One of only two commuter aerial tramways in the United States.

A dilapidated dock tells the story of Titanic's missed arrival.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

A crumbling hospital from the 1850s on Roosevelt Island.

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

This watchtower once presided over the Berlin Wall.

This park celebrates a sister city relationship that survived the Cold War.

Crumbling ruins of the thermal baths that once attracted royals and aristocrats from throughout Europe.

With its mine closed, this old village is starting to resemble a ghost town.

A tribute to an iconic act of defiance from the Croatian War of Independence involving a small car.

The former home of Ernst Jünger, an eccentric German novelist, philosopher, entomologist, and psychonaut.

The world's first jet-powered aircraft were assembled by the Germans in this secret factory in the forest during WWII.

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.

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

This conical hill was built as a testing ground for an engineer known as the Glider King.

An oversized, oddly designed pedestrian overpass has drawn comparisons to a commode for pachyderms.

This strange sculpture depicts a giant nightmare hare crushing a man to death beneath its colossal bulk.

A monument to the "father of modern warfare" Gustav II Adolf.

A statue of Vladimir Illyich Lenin guards this abandoned building in the "Forbidden City."

This natural "sea of stones" was once used by the Romans as a quarry.

This museum is home to a sugar sculpture of the Berlin Airlift Memorial.

During World War II, the Nazis repurposed this beer cellar to store stolen artwork.

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