When you've got to go, you've got to go.

This unassuming museum's slogan translates to “there is a limit of sadness, anxiety has no limits."

An Art Nouveau building covered in animal gargoyles and grotesques.

A massive forgotten storehouse from 1913 on the Brooklyn Waterfront has a spectacular view of Brooklyn.

Fabrication workshop where the encasement for One World Trade Center's beacon was constructed.

A well-worn marker in a forgotten alleyway is all that remains of what had been one of Manhattan's most beautiful buildings.

One of the first major shipyards in Brooklyn.

This seemingly unremarkable boulder is said to bear the hoofprint of the devil himself.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

A staggering collection of photographs depicting medical, social, and historical change.

A small peaceful park and waterfall tucked amid the urban grind of Midtown Manhattan.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

A crumbling hospital from the 1850s on Roosevelt Island.

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.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

A semi-scholarly approach to sex.

New York City's smallest piece of private property.

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

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

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

A hands-on traveling collection of the innovative devices of yesteryear.

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