When zealous marijuana enthusiasts kept stealing the "Mile 420" highway marker, the State of Colorado got creative.

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.

Ute tour guides have been sharing the ancient dwellings and rock art inside this large park with visitors for more than 40 years.

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

In a dry, neglected cemetery lies the unassuming grave of a soldier vilified in life but celebrated in death.

Paleoamericans built these ancient walls high in the Colorado Rockies as part of an extensive hunting system.

Isak Heartstone, a 15-foot wooden troll made out of recycled materials.

A tiny nondenominational church harkens back to the days of the first homesteaders in the region.

This nearly abandoned town was once a thriving mining community until a series of fires.

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

A prehistoric rock shelter that's literally in someone's backyard.

A museum dedicated to the mysterious cryptid.

The final resting place of a 19th-century gold prospector and convicted cannibal.

Hidden beyond a kitschy giant beetle is this remarkably sprawling collection of preserved insects.

A roadside attraction filled with an astounding array of gloriously wacky vehicles.

The oldest operating cemetery in Denver is the eternal home of some of the Centennial State's most famous residents.

A futuristic hovertrain is parked unceremoniously alongside a nondescript road.

Unlike most arches, this geological oddity formed in a volcanic dike.

The final resting place of American icon Buffalo Bill, and a museum that aids in telling his tale.

The huge collection of paintings of the American West is one of Denver's best-kept secrets.

This deserted Gold Rush town is home to a Masonic lodge that, strangely enough, still holds meetings.

See six states, pickled freaks, rocks, and antiques.

A small horde of mythical creatures lurk almost imperceptibly within the museum's wildlife dioramas.

One of the greatest heroes of the Titanic tragedy came from humble beginnings to this beautiful home.