This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

In upstate New York, gorgeous waterfalls and a watermill are slowly being reclaimed by nature.

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

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

One man's swirling six-acre monument of stone.

Lady Liberty's first beacon of enlightenment is now displayed in a museum near the statue.

A bit of retro transportation flair preserved in the world's largest department store.

A once grand hotel is being retaken by the wilderness it once capitalized on.

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

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

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

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

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

Try not to get slimed in Tribeca.

Elevated freight railway turned wildly successful urban park.

Beautiful stained glass depictions of the history of human flight fill this surprising chapel.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

Now home to hardy plants, these sand and gravel dunes once held back a massive prehistoric lake.

A museum dedicated to antique toys, collectibles, and nostalgia.

The graves of a Connecticut family thought to have been plagued by a vampire.

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

Founded by the famed children's book artist, this museum spreads an appreciation of the arts through picture books.

Life-size bronzes of the Grinch, Cat in the Hat, Yertle the Turtle, Sam-I-Am, and the Lorax—and the author himself.

The highest point in the state of New Hampshire, and while unlikely "the worst weather in the world," it sure seems that way to hikers.