There’s a hidden military meme engraved on the World War II Memorial.

Destroyed by flood waters, prison now serves as a training ground for armed forces.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

The hide of Stonewall Jackson's equine sidekick is on display not far from where the ashes of his bones are buried.

A floating museum that was sunk by a flood and left to rot in the tides.

The "lovely red Vega" of the legendary record-settling pilot.

Home to items never before seen by the public.

The United States's largest hand-dug well is topped with a state-of-the-art museum.

This monument to those fallen in the World Wars is accompanied by a U-boat that Germany bought for a Deutsche Mark.

The Kirkland Monument remembers a selfless Civil War hero who braved the battlefield to give water to his dying enemies.

The resting place of a Civil War celebrity's amputated limb.

This former monument to an invented Iraqi victory was turned into a military camp during the subsequent invasion.

Ruins of an aerial tramway that ran for only eight years.

Cannon designed to fire an atomic warhead.

At 207 feet, one of the world's longest continuous escalators.

Home to more than 13,000 pieces of war memorabilia and military equipment.

The Bucyrus-Erie model 1850B electric shovel, or "Big Brutus," the largest existing electric shovel in the world.

An oil baron's wild paradise and the winner of an ill-fated air race.

World's largest barrel containing an inn.

This modern French ossuary contains the jumbled bones of 130,000 WWI soldiers.

Site of one of World War I's most horrific scenes.