In its day this historic fort held 100 cannons pointed in almost every direction to protect New York.

The name of this tiny pocket park tucked between two buildings on Manhattan's Upper West Side is Latin for its location: "seventy-one."

A former insane asylum despised by Nelly Bly and Charles Dickens is now fashionable apartments.

A hyper-luxurious, 12,000- square foot home might be buried beneath Queens, still waiting to protect you from nuclear missiles.

A discreet little stairway on St. Nicholas Avenue leads to a quaint and unexpected cobblestone street of 19th century wooden rowhouses.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

In the middle of downtown Brooklyn lies a 165 year old secret hidden right below the surface (closed to the public indefinitely).

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

Built as a gift to the hottest tastemaker of the time, these hidden quarters remain an Art Deco showpiece.

A clock set into the concrete outside a Manhattan jeweler has been telling time underfoot for over a century.

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."

Detailed facade of a brownstone in Boerum Hill.

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

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

Prove you deserve to be fed by Kenny Shopsin.

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

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

Unique antiquarian shop specializing in globes, maps, and prints.

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

The loneliest island in New York.

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

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

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

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