A landscape of massive spherical boulders are the main attraction in this Kansas State Park.

This is not your typical jungle gym.

This memorial pays homage to Pueblo's four Medal of Honor recipients.

This historic stone barn is the former home of legendary cattleman Charles “Lonesome Dove” Goodnight.

A futuristic hovertrain is parked unceremoniously alongside a nondescript road.

A place of great reverence for Trekkies everywhere, a hero's future birthplace.

This monolithic statue was erected in honor of Chief Black Hawk (even if it wasn't made to look like him).

The world’s largest truck stop includes a barber shop, chiropractor, and a huge museum with antique trucks.

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

This former nursery supplied plants for the creation of Chicago's largest park.

The site of the "Bone Wars" between two rival paleontologists during the dinosaur rush of the 19th century.

The largest self-built castle in the U.S., six decades in the making.

The World's Largest Bull.

In rural Iowa, an imported 19th-century windmill overlooks an unlikely enclave of Danish culture.

The moving metal works of one troubled artist can still be viewed on his front lawn... for now.

This sidewalk tribute honors Colorado's great culinary creation.

Half-sized replica of the Leaning Tower of Pisa built to honor Galileo.

This centuries-old Italian chapel hangs midway down a sheer cliffside.

This massive concrete sculpture is said to be the heaviest communist monument on Earth.

A tunnel with windows, so you don't miss out on the impressive views.

The unusual patterns in this rock formation result from two distinct modes of weathering.

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

Massive still life just off the highway in Kansas.

One of the largest aviation events in the world brings half a million aircraft enthusiasts to Wisconsin each year.