Secluded amid upstate New York’s Adirondack Mountains lies this subterranean emblem of a nation on the brink of nuclear war. And it's for sale.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

Monty Python fans will recognize this abandoned mine as the Cave of the Killer Rabbit of Caerbannog.

Three acres of mythology-inspired sculptures are visible from the highway.

This Catskills museum preserves stumps from the earliest known fossil forest on Earth.

Where a brain, a beauty, a jock, a rebel, and a recluse met one Saturday and changed their lives forever.

A railway bridge leading nowhere stands lonely in the middle of a meadow.

Waterway populated with abandoned projects, including a submarine.

You'll find rocket launchers, not rollercoasters, at Russia's “military Disneyland.”

This frozen-in-time summer home outside Moscow provides a look at Russian life in the 1950s.

The wreck of a B-29 Superfortress now stands as a memorial left in the moors.

These ruins witnessed the final gathering of the failed Jacobite Rebellion.

Steam engines and conveyor belts are remnants of a genius system left in the middle of the Maine woods.

Funded entirely by volunteers and donors this military memorial features a tank with a comedy line on its barrel.

The ruins of one of the first railroads in the U.S. lie hidden within a neighborhood cul-de-sac.

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

This boulder with a 200-word legal dedication to God has remained hidden in the woods for over 150 years.

This massive boulder is inscribed with the story of a sensational hostage negotiation dating back to Colonial times.

Civil War Fort on an island in the Boston Harbor.

The pleasant woodland cemetery that has inspired more than its fair share of wild legends.

Rising 30 feet in the air atop Quarry Hill, the Old Powder House is the oldest stone building in the state of Massachusetts.

This roadside attraction attracts kids with dinosaurs before blindsiding them with geology.

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

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