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

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

Spies, love letters, and ghost stories have all left their mark on this home-cum-museum.

This dilapidated castle-like structure overlooks the Hudson River at one of its widest points and was once home to nuns.

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

One of the earliest bowling lanes in the U.S. doubled as a sewing school during a time when women had little job opportunity.

A millionaire's abandoned swimming pool from the gilded age of one of America's most distinguished families.

The ceiling of this vintage movie palace is covered in fantastic Art Deco murals.

This tiny church near Sleepy Hollow contains Henri Matisse's last work, a rose window, and nine windows by Marc Chagall.

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

This candy-colored storybook village originated as a 19th-century Methodist campground.

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

This once luxurious Catskills resort is now a haunting ruin.

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

Colorful clay cliffs tower over an unofficial nudist beach on Martha's Vineyard.

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

A gardener's enduring labor of love is spread throughout a small Vermont town.

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

Collapsing castle on the Hudson river was once the storage site of military surplus business.

A sewing machine tycoon built this miniature castle for the people and to beautify a lakeshore.

Driftwood dinosaurs lurk within trees covered in a rainbow array of avian abodes.

Marigolds, rosemary, Madonna lilies, and the Virgin’s Bower decorate this Massachusetts sacred garden.

A hamlet full of permanent Christmas spirit holds one of the earliest theme parks in the United States.

A 19th century hat factory still stands as a crumbling ruin in upstate New York.