This boulder with a 200-word legal dedication to God has remained hidden in the woods for over 150 years.

This little-known rival to the Library of Congress houses one of the largest collections of pre-1876 American books, newspapers, and manuscripts.

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

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

More than 200 unconventional musical instruments that anyone can play.

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

This stone tower in a small town's graveyard looks as though it would be more at home in a fairy tale.

The Atlantis of Cape Cod reemerges during the lowest of tides.

Locals say Williams's ghost still haunts the place where she was murdered.

At the supposed instruction of Ben Franklin and Socrates, a Spiritualist believer intended to birth a mechanical messiah here.

A tiny monument to the classic American candy.

Rising 30 feet in the air atop Quarry Hill, the Old Powder House is the oldest stone building in the state of Massachusetts.

An elaborate, hidden model train in the Needham Town Forest.

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

Silverware in the sidewalk outside a grocery store cements this neighborhood’s Italian culinary history.

Sacks of potatoes, made of cast stone, mark where the iconic potato sheds once stood along the river.

A mysterious stone embedded at the base of a historic Boston building.

This Cape Cod museum exhibits what it claims is the only authenticated pirate treasure in the world.

Resonating tubes make music from highway overpass.

It's not a typo, now say it five times fast!

A careful eye can find hundreds of dinosaur tracks running along the Connecticut River.

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

A stunning garden filled with fantastical environmental folk art and sculptures.

A mysterious collection of stones stand outside a small New England town.