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

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

A mental health hospital dating back more than 139 years, now features a museum.

A futuristic hovertrain is parked unceremoniously alongside a nondescript road.

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

Check out a hidden collection of vintage neon signs.

This three-mile concrete levee in Pueblo, Colorado was transformed into the world’s longest painting.

A fitting attraction for the corn capital of the world.

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

A monument to the egos of two railroad magnates that fell into decline along with their careers.

On the edge of grassland in northeastern Colorado, these rock formations are some of the few remnants of a high plain that has eroded away over millions of years.

Roaming bison and a spectacular view at the highest point in Nebraska.

The first declared National Monument in the United States.

Yes, this monument is aware that it is about 20 miles away from the actual center of the United States.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

A ghost town now swarming with dozens of prairie dogs.

A cemetery housing wild west legends in South Dakota.

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

Version of the French Riviera destroyed by the sea.

A giant knight, sex education, date shakes, and Jesus coexist happily in this Coachella Valley desert oasis.

These lush groves of fan palms rise up like oases out of southern California's Colorado Desert.

The ghostly remains of an accidental sea.

World's largest collection devoted to one fruit.

This memorial pyramid marker honors one of the United States Government's first official camel riders.