This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

For over 30 years the walls of this Harlem schoolyard have been a gallery of street art by "Kings and better."

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

Great place to have a drink and a bite to eat in an atmosphere laden with New York's Bohemian past.

This ruined fort hidden at the top of Central Park can't seem to keep from losing its historical plaques.

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

A DIY art gallery/music venue/lecture hall dedicated to video game culture.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

A historic 1890s architectural masterpiece with an iconic clock tower that, once open to the public, now faces an uncertain future.

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

Mysterious 500-year-old tapestries depict a unicorn hunt.

A legendary speakeasy bookstore returns from the brink.

Hidden in an ordinary Midtown building is a one-room museum dedicated to the greatest escape artist.

Peek through the gates at this oasis from the city, full of Old English charm.

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.

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

More gold than anywhere else, ever.

Become a prohibition rebel.

This little museum is built on a theater that was once a wildly elaborate speakeasy.

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

A hip bar decorated with walls of golden skulls.

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