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

This once-grand marvel of engineering is now 41 miles of scenic hiking trail.

Oldest existing wire suspension bridge in the United States.

A winding, cliffside stretch of road overlooking the Delaware River.

The largest known open fault in the United States is basically a giant natural refrigerator.

The lost town of Neversink, sunk by New York City.

This once luxurious Catskills resort is now a haunting ruin.

This small Catskills village has six independent bookstores and more bookshops than restaurants.

Curtiss is a forgotten figure in the early history of flight.

It wouldn't be long after purchasing this farm, Brown would lead his siege on Harper's Ferry.

Teddy Roosevelt’s famous “midnight ride to the presidency" started at this small lake high up in the Adirondacks.

This former theme park in New York's Adirondack Mountains fell into ruin before being resurrected as a state-run campground

This lush forest valley was once mined for lumber to the extent that it was once nicknamed "The Pennsylvania Desert."

A toxic ghost town sitting atop a massive coal fire.

An indoor miniature village and labor of love for Laurence Geiringer, a model railroad enthusiast.

One of the U.S. Forest Service's only mansions is outfitted with a dinner table for floating food.

This park contains a number of standing stones meant to heal and inspire.

This hospital fell into ruins after failing to act as the advocate for the mentally ill it was designed to be.

A trompe-l'oeil statue honoring the first guide dog in North America.

Infamous marsh filled with toxic waste, World War II-era London rubble, and dead mobsters galore.

These unassuming lighthouses have seen the first reading of the Pledge of Allegiance, the first wireless transmission, and more than one mystery.

A farm in New Jersey grew a most unusual crop for AT&T's testing purposes.

The highest point in New Jersey is marked by a massive, if simply named, obelisk.

Historic town settled in the 19th century because of its convenient location along a popular coal transport route.