This lesser-known geographic marker was the reference point for all surveys of the continent for 75 years.

The grandson of a Kiowa chief created what has become the iconic symbol of a city on the Plains.

The world’s largest combined collection of U.S. and Russian aircraft got its start in a poultry building.

A cannon designed to fire an atomic warhead.

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

The first "Hut" was actually a small brick building.

Curious rock formations in a tiny Kansas state park.

A mysterious and terrifying public art goblin seemingly meant to inspire local legend.

Small plaque marks the spot, but the true center is located about half a mile away on a private pig farm.

Marking the spot where a conquistador gave up his search for the fabled Seven Cities of Gold.

The abandoned remnants of a little sanctuary for world peace that fell into disrepair.

This subterranean treasure trove is said to contain a motorcycle, a Chevy, and a teal leisure suit.

Meet cowboys and ancient beardogs at this one-of-a-kind crossroads of Western history.

At 32 feet long, this swing is big enough for the whole family—and then some.

A pop-culture attraction outside of Dyersville, Iowa, hits a home run.

The last location where Buddy Holly, Ritchie Valens, and J. P. "The Big Bopper" Richardson played before their tragic deaths.

This 19th century Sioux City candy company is the home of the Twin Bing, a historic, chocolate-covered treat.

Before it was buried by volcanic ash, this fast-food restaurant fed the hungry hordes of ancient Rome.

The walls and streets of the ancient city are peppered with penises.

Erotic art covers the walls of the largest ancient pleasure palace.

Ancient snack bar of the Roman Empire re-opened.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Go inside to really appreciate this 500-year-old technological masterpiece.