This narrow shop in the East Village hosts a matchmaking service for the new millennium.

The best B-movies filmed on a shoestring budget were born here.

Underneath the bustling city streets, a hydroponic farm grows unique herbs in an urban oasis.

The mummified relics of an American missionary.

This secluded ruin was once a home for exotic plants.

An exhibition space dedicated to American outsider art created between the 18th and 21st centuries.

A notorious punk house turned co-op.

This abandoned caretaker's apartment is one of 13 left in the New York Public Library system.

The artist and New York City icon lived, worked and died in this converted carriage house owned by another iconic artist, Andy Warhol.

The iconic Manhattan corner that was once the site of the Beastie Boys' fake clothing store.

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

This speakeasy continues the Prohibition-era legacy of Harlem's jazzy Swing Street.

Touching mementoes from those who didn't make it back from World War I still hang in one of New York's oldest bars.

Empty, but not abandoned, this cavernous Brooklyn loading dock was once considered the largest individual building in the world.

This small, hidden cove is home to abandoned boats.

Check out the underground party scene at the "Burning Man of Brooklyn."

This hidden library of physiological ephemera contains centuries worth of knowledge on the vim and viscera of the human body.

You can still ride this 100-year-old work of art in Brooklyn's largest public park.

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."

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

Historical figures from New York City's Catholic community reside in Midtown.

This innocent-looking townhome is actually a subway exit.

A collection of fanzines, recordings, and documents detailing the rise and influence of the feminist punk movement.

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