A Bed-Stuy gymnasium that hosts expansive raves, performances, dance parties, and more.

An accidentally hidden library containing the ephemeral history of New York.

Staten Island's original central park is the former home of the city water supply as well as thousands of immigrant graves.

This old estate is a remnant of when the Bronx was a popular summer destination for wealthy New Yorkers.

The longest continuous underwater road in North America was built at the insistence of Franklin Roosevelt.

Once a dumping spot, now a park with a kayak launch.

Take in a rare, face-to-face glimpse of Lady Liberty at this tucked away Red Hook park.

Down a stairway in the East Village, you could once read a plaque describing an alternate history of a fictional version of Manhattan.

An arcade packed with a rotating collection of unique independent video games.

Little Red Lighthouse under the George Washington Bridge.

This abandoned seaside fortress is now simply an imposing ruin being taken back by nature.

Once America's longest-manned military fort, now an abandoned hulk.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

From scholastic to sepulchral - now under reconstruction.

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

A popular European tradition makes its way to the states on one of America's most famous bridges.

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

The oldest surviving synagogue in New York City is now a soaring art space.

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

A legendary speakeasy bookstore returns from the brink.

More gold than anywhere else, ever.

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

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

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