An alley way dedicated to graffiti and street art is a constantly changing street gallery.

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

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

The tomb of Increase Mather and his son Cotton, influential colonial ministers obsessed with the occult.

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

From economic backbone of a community to deadly diving hole, these former stone quarries are now a park for rock climbers and graffiti artists.

Ice cream stand, snack bar, and time capsule of milk conveyance.

Palatial mansion estate used in films including "Flowers in the Attic" and "The Witches of Eastwick."

This railroad tunnel was once the longest in Massachusetts.

America's original house of worship for Spiritualism, the religious movement based on communing with the dead.

The history of the tea trade is told in bas-relief on this historic pair of Boston doors.

Narrowest house in Boston.

This tiny, painted door at the base of a tree stump has been a fixture of the Harvard University campus for decades.

Inspiring Herman Melville and Henry David Thoreau, Mount Greylock in western Massachusetts is the highest point in the state at 3,491 feet above sea level.

Located just behind a quiet residential neighborhood, this is ground zero for the Salem witchcraft hysteria of 1692.

The bears may be gone, but their old cages can still be found.

The Mysterious Witch Bonney, a haunted statue in an old industrial city.

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

This miniature feudal castle was built on a whim to honor a US Navy pioneer.

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

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

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

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

Radical Bookstore and Community Space.