Red frames showcase remnants of one of New York's original subway stations.

A once crucial portion of the Long Island railroad still lays abandoned, waiting to be turned into an urban park.

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.

Nikola Tesla's former home contains an homage hidden from plain sight.

This semi-hidden Manhattan restaurant is based out of a loading dock.

From scholastic to sepulchral - now under reconstruction.

This former Norwegian sailor's church is slowly being taken over by ramshackle robot musicians.

This ruined fort hidden at the top of Central Park can't seem to keep from losing its historical plaques.

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

Home to the infamous "Typhoid Mary" and the worst loss of life in New York's history prior to September 11, 2001.

A tunnel once abandoned now thrives with graffiti art as an off-limits makeshift gallery.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

Spies, love letters, and ghost stories have all left their mark on this home-cum-museum.

The former estate of the Guggenheims, part of the opulent Gold Coast that inspired the Great Gatsby.

An isolated beacon with a history of grisly murder and a view of some of literature's greatest inspirations.

The loneliest island in New York.

An abandoned subway tunnel that could have reinvigorated Staten Island still lies somewhere beneath this Brooklyn park.

This small, hidden cove is home to abandoned boats.

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

A band of aerialists and circus performers putting on incredible shows in East Williamsburg.

Abandoned power station once home to a squatter community, now being developed into an arts center.

Neon signs that grace the windows of Bergdorf Goodman's and Tiffany & Co. come from this studio in Brooklyn.

The abandoned grounds and derelict greenhouses of this once-magnificent Edwardian estate are now a nature preserve open for exploration.

An abandoned Gold Coast-era mansion once intended for the exiled ruler of Albania, who never arrived.