A mysterious, abandoned building rotting on the Brooklyn waterfront.

This Queens hospital has stood abandoned for almost 20 years after its patients were secretly relocated in the dead of night.

The haunting, dilapidated remains of a former poorhouse on Staten Island's Greenbelt.

The most unloved grain elevator in Brooklyn was a “Magnificent Mistake.”

I fought the law and the precinct caved in.

A former connection to City Island, it has been abandoned since the 1930s.

Long the exclusive domain of birds and vagabonds, this little-known Central Park peninsula is open to the public once more.

This abandoned subway station can still be seen on regular commuter trips.

Just your average Marie Antoinette–themed speakeasy in an abandoned 19th-century subway tunnel.

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

A very classy 1920s-era bar right in Grand Central Station.

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

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

This royal shrine and cemetery is hidden amidst modern public housing.

The ship that got left behind.

Oh, just a motel on the edge of the desert decorated with thousands of clowns conveniently located next to an abandoned graveyard.

A line of abandoned, alien-like fortresses dot the mountains of North Italy.

An inconspicuous footbridge beloved by San Diego locals.

Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

Lemon Grove, California is known for its giant lemon...and mummified bodies.

A meditative space out of a fantasy story.

One of the largest cat sanctuaries in North America is considered a "Club Med" for felines.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.