A prohibition era watering hole for the police.

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

One of the few remaining American elm trees in New York’s Tompkins Square Park was the birthplace of a new religion.

This plot of old-growth forest is the largest surviving remnant of New York City's original woodland.

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

Once America's longest-manned military fort, now an abandoned hulk.

The oldest living tree in Manhattan comes shrouded in sinister legend.

Visit the monolithic tomb of America's most famous general.

Hordes of precariously balanced stone figures crowd the shores of the Hudson River.

Deep under Manhattan is the largest construction project in city history. So far, the project has taken the lives of 23 workers, or "a man a mile."

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

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

A dark, dank room in subterranean Manhattan was the site of a ghastly murder.

The beautiful tunnel that ran from the lobby to Penn Station is still hidden underneath 34th Street.

The final resting place of the great escape artist, where some still gather to wait for his escape from death.

A popular European tradition makes its way to the states on one of America's most famous bridges.

First a horse rendering plant, then a 19th century landfill, this beach is full of glass from thousands upon thousands of broken bottles.

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

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

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

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

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

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