The smallest island in Manhattan is a manmade landfill dominated by a Buddhist peace arch.

This abandoned artificial island off the coast of New York City is now home to dozens of harbor seals.

First a horse rendering plant, then a 19th century landfill, this beach is full of glass from thousands upon thousands of broken bottles.

19th century cemetery hidden in Brooklyn's Prospect Park.

Built as a gift to the hottest tastemaker of the time, these hidden quarters remain an Art Deco showpiece.

The famous facade of Grand Central Terminal hides a regulation tennis court, and it's not the first one.

This abandoned caretaker's apartment is one of 13 left in the New York Public Library system.

The beautiful tunnel that ran from the lobby to Penn Station is still hidden underneath 34th Street.

A controversial magical figure is hidden within a diorama of the city.

A hidden bar inside an ad agency has a deliberately misleading name, so employees can stay late under pretext of paperwork.

A hidey-hole sandwiched between cellphone, DVD, and jewelry stores features Tibetan delights.

This small, hidden cove is home to abandoned boats.

A Ukrainian church canteen doles out hearty fare in an East Village basement.

Enter the deli, walk until you hit the taxidermy, then order some hot, homey guisado.

Sunset Park's Guatemalan community knows to head to the back of this bodega for a taste of home.

Every dish is blessed in this basement eatery beneath a Hare Krishna temple.

This Russian bar-restaurant lies within a three-story underground bathhouse.

This Los Angeles animation studio is keeping the wonder of stop motion puppetry alive.

Panorama exhibition hall in old silent theater with a beautiful backyard garden.

A hospital closed seemingly in the middle of operations, leaving behind fodder for horror films and ghost hunters.

This plaque marks the spot where the first crossing guards helped get kids safely to school.

This double-arched masonry highway bridge is the only structure of its kind in Minnesota.

This statue of Olympic hockey coach Herb Brooks immortalizes one of the greatest moments in American sports history.

Where the notorious gang lived while on the run from the FBI.