The abandoned grounds and derelict greenhouses of this once-magnificent Edwardian estate are now a nature preserve open for exploration.

This sandstone gorge in New York State's Adirondack Mountains is home to waterfalls, flumes, and more.

A castle built for love, and abandoned due to heartbreak.

The home of one of America's most wealthy industrialists is now a historic site that remembers a more decadent time in the country's history.

For over 80 years, Mayan ruins stood proudly in a most unlikely location.

The world's largest kaleidoscope, designed by a 1960s psychedelic artist.

Discovered by cows, these upstate New York show caves are presented with a healthy dose of psychedelic folk art.

Not even a series of devastating fires could keep this odd castle in upstate New York from bouncing back.

The abandoned ruins of America's first private zoo are open for exploration in the Catskills.

An unrealized dream to wirelessly electrify the entire Earth.

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

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

This Central New York ghost town was once a prosperous railroad community.

Protecting the future of some of the rarest and most misunderstood mammals of North America.

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

A former insane asylum despised by Nelly Bly and Charles Dickens is now fashionable apartments.

A deteriorating 1990s Girl Scout camp in a beautiful lush park on Lake Ontario.

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

The site of a tragic massacre that spawned a multimedia franchise.

Cryptic messages embedded in the New York City sidewalk.

Check out the underground party scene at the "Burning Man of Brooklyn."

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

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

A ruined mansion hidden in the woods of the Hudson Valley, home of a tragically doomed romance.