This railroad tunnel was once the longest in Massachusetts.

Civil War Fort on an island in the Boston Harbor.

Hut with supplies for shipwreck survivors.

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

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

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

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

The sprawling, eccentric estate of Ames and Ames, a brilliant botanist, and a genius inventor and artist.

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

Resonating tubes make music from highway overpass.

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

An old trolley bridge was converted into a breathtaking garden bursting with colorful flowers.

Run by a eugenics advocate, this aging institution conducted secret radiation experiments sponsored by Quaker Oats.

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

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

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

This small section of the Sleepy Hollow Cemetery is rotten with famous authors' graves.

Over fifty whirling pools left by the glacial age.

One of the most scenic falls in Massachusetts has a history of death and grim legend.

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

19th-century operating theatre in which the use of ether was first demonstrated - plus, a skeleton and a mummy!

Two thousand artifacts from around the world collected by one woman who loved to travel.

The inspiration for H.P. Lovecraft's horror stories and Batman's Arkham Asylum is now a condominium complex.

To avoid the demolition costs this abandoned drawbridge was simply left in the up position.