Naturally formed white marble arch housed in an abandoned marble quarry from the 1800s.

The only remaining place where you can play this century-old game for cash.

The ruins of one of the first railroads in the U.S. lie hidden within a neighborhood cul-de-sac.

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

More than 200 unconventional musical instruments that anyone can play.

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

This massive World War II calculator hearkens back to the days when "computer" was a job title.

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

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

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

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

Trash escaped from a landfill to fill beaches with all kinds of treasure.

A cave dug by a man directed by ghosts to find pirate treasure.

A historic bridge with a lovely acoustic anomaly.

The exact whereabouts of this surreal cabinet of curiosities are rarely the same place twice.

One of the few remaining monuments dedicated to South Boston's Irish heritage.

A unique music museum housed in a historic Boston theater.

Radical Bookstore and Community Space.

This mysterious artificial cave has long puzzled New Englanders.

The only certified Trappist brewery outside of Europe hides in the central Massachusetts hills.