Curious rock formations in a tiny Kansas state park.

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

These elevated trucks were put in place as a middle finger to The Man, but are now considered folk art.

Home to Hollywood history and a very special salt crystal.

One of the Eight Wonders of Kansas and the first official National Natural Monument these stark formations look like nature's Stonehenge.

A short tunnel built straight through a magmatic dike.

Built in 1981 in collaboration with Andy Warhol, this giant piece of pop art stands on the campus of Colorado State University.

Winter and summer solstice aligned sculpture in the middle of nowhere.

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.

Take a self-guided tour through one of Colorado's most elevated mining districts.

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

Take a dip in the world's largest mineral hot springs pool.

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

This remote Colorado canyon is home to the second-largest collection of natural arches in the world.

This marker identifies the location where three states converge.

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

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

Toss a Frisbee through the ruins of this Colorado gold mining town.

A futuristic hovertrain is parked unceremoniously alongside a nondescript road.

In the early 1900s, hundreds of Black Americans found opportunity in this now-abandoned rural community.

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

This razorback ridgeline has doubled as a scenic drive since the early 1900s.

In the middle of a suburban Denver neighborhood is a cave that once provided solace for a prominent Ute chief and his family.

This once-popular otherworldly landscape was formed by one of the largest volcanic eruptions in history.