An unrealized dream to wirelessly electrify the entire Earth.

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

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

Reclaimed by nature, the ruins of Doodletown, New York are remnants of a town consumed by a state park.

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

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

A natural gas leak provides a flickering flame beneath a waterfall.

An abandoned castle owned and ignored by Masons carries a cursed history.

Mysterious 500-year-old tapestries depict a unicorn hunt.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

A crumbling hospital from the 1850s on Roosevelt Island.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.