From scholastic to sepulchral - now under reconstruction.

The loneliest island in New York.

Just your average Marie Antoinette–themed speakeasy in an abandoned 19th-century subway tunnel.

This empty Victorian manse on Staten Island is said to be haunted but is actually a real life crime scene.

A band of aerialists and circus performers putting on incredible shows in East Williamsburg.

A natural gas leak provides a flickering flame beneath a waterfall.

A once grand hotel is being retaken by the wilderness it once capitalized on.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

The abandoned husk of a mental institution that failed to save a Jazz Age icon still sits nearly unchanged.

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

Collapsing castle on the Hudson river was once the storage site of military surplus business.

Sniff the Titan Arum's rotting flesh.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

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

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

This lower Manhattan bar is set up in an old bank vault that rests beneath a skyscraper that hides even more historic splendor.

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

A crumbling hospital from the 1850s on Roosevelt Island.

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

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

Over 100 concrete munitions bunkers are all that remain of a Pennsylvanian village seized by the US government.

This Central New York ghost town was once a prosperous railroad community.

Not even a series of devastating fires could keep this odd castle in upstate New York from bouncing back.