The remnants of a 19th-century ironmaking complex hidden in the woods of Connecticut.

A former copper mine which became a truly unsuccessful prison.

An abandoned Depression-era zoo hidden just off the highway.

Said to be haunted, this tower was constructed by a sugar importer as a gift to his wife.

How this Pine Barrens hill got its name is uncertain, but on a good day the view from the fire tower is crystal clear.

Now abandoned, the first public health hospital in the U.S. saw more than one million immigrants from around the world.

The creek where a shark wreaked terror upon New Jersey, and served as the inspiration for "Jaws."

The remains of a century-old mansion that met a fiery demise years after it was deserted.

The remains of a 19th century spring, and the site of an infamous unsolved murder.

A recently abandoned psych ward at the end of Sanatorium Road.

In the woods of New Jersey lie the ruins of a munitions village abandoned after World War I and the remnants of a 1920s wooden racetrack.

This tiny New Jersey village has lived many lives but seems determined to remain a ghost town.

This historic iron-working village is now a ghost town so immaculate that it looks as though it was recently built.

Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

Series of storm drains connected to a dark urban legend.

Enchanting gardens surround a derelict mansion, all hidden in plain sight behind a stone wall.

Once part of an extensive network of fire towers, this is one of the few remaining in this Wisconsin forest.

Software company Epic Systems has created one of the strangest and largest workplaces of all time.

More than 5,000 contemporary and "historic" mustards from around the world.

Eternal resting place of the grave robber and murderer who served as inspiration for many of cinema’s famous madmen.

An old dining hall now serves up ghost stories for lusty locals.

Home on the Hillside, and home of the first breakfast cereal.

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

A space-age 1950s pavilion on a secluded path is full of Toronto history surprises.