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

A river runs through this remote valley in a very unexpected way.

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

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

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

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

This interpretive path lets you get up close and personal with dinosaur bones.

A collection of fading fantasy tchotchkes lines this dirt road in the Colorado wilderness.

These decaying bridges 1,000 feet high are a reminder of the skill it took to cross the Colorado Rockies by rail.

A downtown park built on top of unclaimed graves.

At the tallest peak in Colorado, an electrifying mix of thin air, lightning, and rivalry.

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

The highest paved road in North America winds its way up Mount Blue Sky in Colorado to an altitude of 14,130 feet above sea level.

A little-known hot spring haven right below the highway.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

Despite being one of the most photographed vistas in the Rockies these twin peaks are rightfully known as the "Deadly Bells."

The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.

The highest bridge in America was built for an almost unnervingly small amount of money.

When ecosystems collide in the arid Southwest.

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

Strange red rock formations that have been attributed to a higher power for hundreds of years.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

This modern antique shop is a museum for 1980's Saturday morning cartoon culture.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.