One of Australia's largest secondhand bookstores.

On this island, you suck away your garbage via an elaborate pneumatic tube system.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

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

A celebration of capitalism in Midtown.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

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

One of only two commuter aerial tramways in the United States.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

A crumbling hospital from the 1850s on Roosevelt Island.

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

Once a flowing stream and where the USS Monitor, the world's first ironclad, was built and launched.

A 120-year oil leak slowly unleashes more gallons of oil than the Exxon/Mobil disaster.

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

World's first "penitentiary," meant to be humane, drove men insane.

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

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.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

Built hundreds of years ago this downtown iron barrier once protected a much despised king.

Currently housing a corporate bank branch this building at the southern tip of Manhattan was once the gateway to luxury vacationing.

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

Try not to get slimed in Tribeca.

The greatest real estate coup of all time.