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

A dangerous narrow-gauge railroad once traced a route through this striking canyon.

Colorado's only true geyser is hidden within the San Juan National Forest.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

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

When ecosystems collide in the arid Southwest.

Two tall rocks sit at the center of this site, once the home of a large Ancestral Puebloan community.

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

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

Once owned by the largest employer in Colorado, these ovens have been abandoned for over a century.

This Rocky Mountain mansion was the luxurious home of the authoritarian leader of a company town.

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

Colorado's only active volcano last erupted around 4,000 years ago.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

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

An ADA-accessible trail and deck offering stunning views of Colorado’s Mount of the Holy Cross.

The narrow mountain road that carves a path between Florence and Victor is tied to ghost towns and ghost stories.

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

A futuristic hovertrain is parked unceremoniously alongside a nondescript road.

Meet Rita the Rock Planter, one of Danish sculptor Thomas Dambo's enormous wooden trolls.

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

This hot dog-shaped diner has moved all around Colorado, never been to New York.

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.

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