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

Ornate and macabre headstone in one of the country's oldest cemeteries.

This mysterious artificial cave has long puzzled New Englanders.

This headstone-like marker inscribed with three words has been an utter mystery for over a century.

One of America's most historic homes also holds a startling literary legacy.

The oldest surviving wood-frame building in North America is still in the family.

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

It was an experiment to prove that glacial boulders and rocks can be used in constructions and dwelling.

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

Hut with supplies for shipwreck survivors.

According to legend, Bob Dylan sneaks in twice a year to eat dinner with Jack.

The homestead of American patriot John Adams.

A coastal rock outcrop with mysterious inscriptions variously attributed to Native Americans, Portuguese, Phoenicians, Norse, and more.

The filming location of a shark attack in Steven Spielberg's famous shark movie.

Overgrown ruins of a turn of the century island fort that sees very few visitors.

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

Home to the Titanic Historical Society's collection.

Resonating tubes make music from highway overpass.

The macabre graffiti spectacle in a quarry in a Massachusetts forest reservation.

This picturesque abandoned home is rumored to be a spite house.

A spooky and decrepit mental health facility is slowly being replaced with newer digs.

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

The railroad tunnel nicknamed the "Bloody Pit" for taking the lives of hundreds during its construction.

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."