Read a book next to a Midtown waterfall.

A long abandoned hospital building on the outskirts of NYC.

A partially hidden wall graffitied by spectators of the 1976 Bicentennial, recently rediscovered.

Commemorating the spot where the famous scientist fed his pigeons.

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

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

A crumbling hospital from the 1850s on Roosevelt Island.

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

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

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

The world's oldest hologram gallery and the labyrinthine laser laboratory of a holography pioneer.

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

A dilapidated dock tells the story of Titanic's missed arrival.

One kilometer of thick brass rod laid out before your eyes.

Three-story slide through the New Museum.

Plot your trip through the city on the sidewalk.

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

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

An odd, ancient window that may have once been part of a brutal prison is embedded in the side of New York's Police Plaza.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

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

Abandoned power station once home to a squatter community, now being developed into an arts center.

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