An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

During the holidays, a vintage subway train whisks New Yorkers back in time.

The loneliest island in New York.

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

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

Great place to have a drink and a bite to eat in an atmosphere laden with New York's Bohemian past.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

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

This empty Victorian manse on Staten Island is said to be haunted but is actually a real life crime scene.

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

Love, knishes, and best wishes from this legendary Lower East Side bakery.

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

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

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

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

A natural gas leak provides a flickering flame beneath a waterfall.

A once grand hotel is being retaken by the wilderness it once capitalized on.

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

One of the last Jazz Age "Wonder Theaters" in New York City.

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

Behind a bodega is a small museum of relics and ephemera showcasing the history of New York.

An unassuming secret door once led to a legendary watering hole.

Tucked in a nondescript downtown Brooklyn mall is a bar containing a remarkable turn of the century anatomical wax collection last seen in 1920s Berlin.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.