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

One of the largest public collection of historic armored and military vehicles in North America.

In the middle of a New England forest sit the crumbling ruins of World War II-era ammunition storage bunkers.

This cave was once thought to be a hiding place for the devil.

Small caves once used as a hiding place for some of those accused during the Salem Witch Trials.

The only certified Trappist brewery outside of Europe hides in the central Massachusetts hills.

Ruins of the elaborate house where the enigmatic costume designer threw glamorous parties for New York's theatrical elite.

The largest collection of historic military firearms in the United States.

This decrepit abandoned building is made all the more eerie by its dark history.

All that remains of this Massachusetts town, demolished in the name of progress, is a stone marker.

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

This railroad tunnel was once the longest in Massachusetts.

This Tudor-style mansion is home to the first roadside confectioner in the United States.

See four top-secret US spy aircraft of the Cold War era, including the legendary SR-71 Blackbird and the A-12 Oxcart.

World War II-era Nazi compound nestled in the Santa Monica hills.

Salt is slowly eating away this abandoned saltworks town in the desert.

While you're unlikely to find riches here these days, this remote mine is a time capsule of the Gold Rush era.

This old mining town, deep in the California desert, has a year-round population of one.

The location of the last stand of Charles Manson's doomsday cult.

The "3rd largest" city in California is an empty mirage of suburbia in the middle of nowhere.

Abandoned hotel with adjacent lake and golf course.

The liveliest ghost town in the state.

Where decommissioned airplanes and helicopters go to become part of Hollywood.

A dry lake is what remains of a community founded on a real estate scam.