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."

Wine bottle sculpture with a ship's stateroom inside.

This innocent-looking townhome is actually a subway exit.

The end of the 4 Line is also the end of the line for 300,000 souls in one of NYC's most illustrious cemeteries.

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

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

Unlock the secrets of the conjuring arts.

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

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

The loneliest island in New York.

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

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

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

Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

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

The oldest operating apothecary in the US has treated everyone from Thomas Edison to Mark Twain.

The "Seinfeld" diner.

This little museum is built on a theater that was once a wildly elaborate speakeasy.

A hip bar decorated with walls of golden skulls.

Try not to get slimed in Tribeca.

The world’s oldest and biggest bookstore stocking only mystery, crime fiction, espionage, and thrillers.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

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