A peaceful international sculpture garden in upstate New York.

100 massive sculptures in the Hudson River Valley.

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

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

An unrealized dream to wirelessly electrify the entire Earth.

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

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.

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

This abandoned seaside fortress is now simply an imposing ruin being taken back by nature.

The absurd creation is a compulsory destination for selfies in Buffalo.

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

What was once a trend-setting, phrase-coining icon of architectural splendor is now a rotting, forgotten hulk.

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

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

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.

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

Once America's longest-manned military fort, now an abandoned hulk.

Hordes of precariously balanced stone figures crowd the shores of the Hudson River.

First a horse rendering plant, then a 19th century landfill, this beach is full of glass from thousands upon thousands of broken bottles.

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.

This ruined fort hidden at the top of Central Park can't seem to keep from losing its historical plaques.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.