One of the first intercontinental ballistic missile sites in the United States.

A striking sculpture built to honor the women of the Lakota and Dakota Nations.

The only fully-realized skyscraper built by the famed American architect, Frank Lloyd Wright.

Three hundred years of preserved Spanish colonial history in San Antonio.

The world's largest private aircraft collection.

A Florida college boasts the world's largest single-site collection of structures designed by Frank Lloyd Wright.

A monument celebrating the idea of reaching inaccessible places.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.

This functioning mill was built in the 1970s using parts from several other West Virginia mills.

Frank Lloyd Wright’s most iconic home dangles over a Pennsylvania waterfall.

One of Frank Lloyd Wright's greatest—and favorite—architectural masterpieces was almost lost.

This historic fort spans more the 300 years.

Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

Dozens upon dozens of boulders engraved with scripture tell the story of one man's troubled life.

The site of America's first commercial oil well essentially disappeared after the town went bust.

Where the oil industry began.

An abandoned railroad tunnel transformed into a creepy path for hikers and cyclists.

Priceless space junk on display in front of a local Dairy Queen.

This public space is speckled with the eerie remnants of a defunct amusement park.

An American flag was erected for every day that passed during the Iranian Hostage Crisis.

Check out the 125-pound chocolate reindeer in the back of this candy shop.

Rows of 19th-century brick ovens used to process coal into coke form the center of a wooded park.

Mausoleums, astronomy, and animatronic dinosaurs at this memorial to an assassinated American president.