The iconic Manhattan corner that was once the site of the Beastie Boys' fake clothing store.

The notorious headquarters of a corrupt political machine.

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.

Visit the monolithic tomb of America's most famous general.

Cryptic messages embedded in the New York City sidewalk.

An artist's cute bronze subway sculptures belie his violent artistic past.

A hidden "place of interment for gentlemen."

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

Lie in a hammock where George Washington stood.

The walls are decorated with whimsical murals painted by the creator of the Madeline franchise.

This semi-hidden Manhattan restaurant is based out of a loading dock.

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

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

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

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

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

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

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

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

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

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

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

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.