The only surviving prototype of Buckminster Fuller's revolutionary car.

Only intact Ichthyosaur skeleton in the United States.

Visitors can walk over the largest concentration of Columbian mammoths to have died from one event.

The only diamond mine in the world where you can keep what you find.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

See massive fossils that are over 200 million years old in northeastern Arizona.

A gothic palace of endless stalagmites and pseudoscorpions waits within one of the world's most beautiful caves.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

A statue honoring 44 continuous years of greeting passing ships.

The remnants of the fortress that saved Georgia from the Spanish still stand guard on their swampy island.

Georgia's first brewery is also one of its oldest surviving buildings.

This kitschy tavern is also home to rare early editions of "Treasure Island."

Constant erosion has created a surreal landscape of bleached and preserved fallen trees.

An unfinished rail tunnel that has since been used to house cheese and bats.

The arch that celebrated the completion of the Lincoln and Victory highways.

An iconic 1960s theater with a Buckminster Fuller-style geodesic dome.

A former mining hospital is now a vibrant artistic hub.

This beloved roadside attraction welcomes visitors with his signature neon smile.

Small Nevada town embraced its designation as the "Armpit of America" with an Old Spice-sponsored festival.

Curiously, this large sporting goods store features 14 wax representations of American presidents.

Bill Murray bowled three straight strikes here at Reno's "Taj Mahal of Tenpins."

Historic home to one of the most famous women pioneers of the 19th century.

Back in the day everyone who was anyone played this historic western theater.