100 massive sculptures in the Hudson River Valley.

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

Home of Philip Johnson, one of the 20th century's most influential architects.

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

Final resting place of Typhoid Mary.

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

The first "Hall of Fame" in America was designed by legendary Gilded Age architect Stanford White for what was then the NYU uptown campus.

Little Red Lighthouse under the George Washington Bridge.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

Holding the most bodies of any cemetery in the United States.

Final resting place for the Triangle Shirtwaist fire’s unidentified victims.

Con Edison’s exotic and heat-loving pests.

World Trade Center memorial likened to a woman's sexual organ.

Oldest surviving example of a Dutch saltbox frame house in America.

A graffiti Mecca welcoming artists from around the world.

A curious friendship between two inanimate ladies.

A mass grave for victims of one of the city’s worst fires.

Wine bottle sculpture with a ship's stateroom inside.

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

A crumbling hospital from the 1850s on Roosevelt Island.

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

Enormous one time fiber mill now houses local artists and small businesses.

A group dedicated to promoting boating, kayaking and environmental education programs.

One of the deadliest American air disasters is nearly forgotten in Brooklyn.