A living antique aviation museum in the historic town of Red Hook, New York.

This natural rock "church" might not be a proper chapel but that doesn't mean it's not beautiful.

This isolated community does not want you to visit.

Surrounded by low rise buildings and partially converted into an auto body shop, this marble archway is the only vestige of a forgotten Manhattan estate.

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

The only intersection in America where the buildings on all four corners were built pre-Revolutionary War.

The attic and basement house two museums stuffed with oddities like swallowed spoon handles and a shrunken head.

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

Oldest existing wire suspension bridge in the United States.

This forlorn park is the result of a failed investment turned tax dodge.

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

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

This hidden oasis features a stunning view of the Hudson River and the Palisades from a castle-like museum.

This old-fashioned candy shop, ice cream parlor, and diner served as the setting for one of TV's most controversial series finales.

An abandoned asylum once on the cutting edge of lobotomies may be reborn as a Christian college.

The second largest maple syrup producer in the U.S. runs a high-tech operation.

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

Along the Palisades skyline are the ruins of a large mansion built in 1911 and demolished in the 1930s.

America's greatest forgotten garden and the former stomping grounds of Son of Sam.

An abandoned horticulture institute gloomily presides over rows of derelict and vine-wrought greenhouses.

This old cement mine has been used as everything from a mushroom farm to a recording studio.

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

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

These World War I shooting range tunnels are now haunted halls of underground graffiti accessed through the roots of a tree.