The site of the first "historically true" UFO encounter in the U.S.

This Gothic castle was inspired by Erik the Red's Viking residence at Brattahlid in Greenland.

An eccentric inventor's castle home with its own indoor weather system.

A New England ghost town features a trail of boulders etched with intriguing life lessons.

Around 100 sculptures from artists all over the world decorate the hiking trails surrounding this locale.

On top of Gibbet Hill lie the ruins of a lavish turn-of-the-century estate that never quite came to be.

Plans for this peninsula included houses, the United Nations Headquarters, and a nuclear power plant. When none of them worked out, it became an expansive park.

Explore the dark underground corridors of this graffiti-covered former military fortification.

Ruins of the elaborate house where the enigmatic costume designer threw glamorous parties for New York's theatrical elite.

This abandoned neighborhood is now a park filled with beautiful trees, wildflowers, and hints of its past.

Locals purchased this abandoned quarry in order to make sure it continues to be overgrown.

The walkable ruins of an 19th century hotel, destroyed in a horse cremation gone wrong.

The ruins of a Massachusetts prison farm can still be found crumbling the woods of a state park.

The largest body of water in Massachusetts annihilated four small towns just to slake Boston's thirst.

All that remains of this Massachusetts town, demolished in the name of progress, is a stone marker.

This mysterious artificial cave has long puzzled New Englanders.

This evocatively named natural crevasse was created by a torrent of water that smashed right through a granite deposit.

This massive boulder is inscribed with the story of a sensational hostage negotiation dating back to Colonial times.

This railroad tunnel was once the longest in Massachusetts.