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

For over 30 years the walls of this Harlem schoolyard have been a gallery of street art by "Kings and better."

A masterpiece of LGBT art has been restored in what may now be the most valuable restroom in America.

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

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

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

A historic 1890s architectural masterpiece with an iconic clock tower that, once open to the public, now faces an uncertain future.

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.

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

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

From scholastic to sepulchral - now under reconstruction.

The name of this famed hospital was once a byword for the horrors of medical and psychiatric care.

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

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

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

One of only two commuter aerial tramways in the United States.

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

A New York garbage depot holds a secret collection of weird and wonderful refuse.

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

Try not to get slimed in Tribeca.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

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

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

A crumbling hospital from the 1850s on Roosevelt Island.