A formerly abandoned mental institute, now back in business.

Off a hiking trail in Rhode Island stands a picturesque memorial to a long-forgotten war.

These World War I shooting range tunnels are now haunted halls of underground graffiti accessed through the roots of a tree.

This fairy tale-themed amusement park is now abandoned, and childhood metaphors abound.

The second-largest (of only two in the world) large particle collider is the underdog of experimental physics.

Beneath the mossy overgrowth covering this once-sprawling campus lies decades of history and the secrets that come with it.

A millionaire's abandoned swimming pool from the gilded age of one of America's most distinguished families.

An eccentric playboy's astounding natural history collection.

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

The intriguing personal collection of a professional demon-chaser.

This "thrice-cursed" island is allegedly home to Captain Kidd's lost treasure.

House used in the 1971 horror film "Let's Scare Jessica to Death."

Made of bronze and wearing a blue gown, this lady sat in the same location in the Yantic Cemetery for more than 119 years.

Yale University's home for rare works, including the mysterious Voynich Manuscript.

This series of landscape dioramas tell the story of New England forestry in exacting miniature detail.

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

This strangely amalgamated museum explores the history of the Timex clock company as well as archaeology.

Memorial to one of the most fatal fires in both circus and U.S. history.

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

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.

Despite violent work crews and massive delays this abandoned canal tunnel was built to last into the modern day.

This museum devoted to the gothic author holds such interesting ephemera as his socks and walking stick.

The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

Edgar Allan Poe's old dorm is now a shrine to the author's legacy.