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

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

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

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

Become a prohibition rebel.

A crumbling hospital from the 1850s on Roosevelt Island.

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.