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

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

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

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

"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."

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

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

The former locus of Boston's high culture has been shuttered and buried for over 70 years.

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

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

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

Eclectic collections, artwork, and some feline friends fill the writer's former home.

The headquarters in Salem doubles as an occult art gallery.

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

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

Experience the hysteria of a 17th century witch hunt through goofy reenactments and wax dummies that should probably be burned at the stake.

Radical Bookstore and Community Space.

The thousands of shades on display — some toxic, others impossibly rare — are a library of more than just color.

The site of one of the strangest disasters in history—a wave of deadly molasses traveling at 35 mph.

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

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

Memorial of the Salem witchcraft hysteria in the town of Danvers, where it all began.

This former Masonic hall has been turned into an art project that uses even more metaphysical iconography.

The often-overlooked ruins of one of the first buildings designed by famous landscape architect Frederick Olmsted.