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

A tiny town’s tiny museum with some gigantic residents.

For over a century, it has been a tradition to raise a flag at the top of this 450-foot sandstone pillar on the 4th of July.

A long and winding trail through history led to the current iteration of this mountaintop tower.

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.

A short but powerful waterfall resides amid Colorado’s Great Sand Dunes.

Above Breckenridge, a destructive mining technique sits sunken in a small pond.

Up-close opportunities to see working birds of prey.

This Colorado fire station has been in continuous operation for more than a century.

This gallery is home to everything from antiques, to ancient tribal masks.

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

A riverside tiny house with books and other treasures galore.

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

A remote sandstone plateau named for a legendary cattle rustler.

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

It takes a nine-mile hike to reach these hot springs, but weary hikers are rewarded with stunning views and a warm soak.

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

This 19th-century ranch is being transformed into a residential library with thousands of books about the natural world.

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

All that remains of this once-booming mining town are the ruins of a saloon.

"All Mountains - All The Time."

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

Located in the world's highest-altitude Dark Sky Community, this observatory welcomes amateur and professional astronomers alike.

A unique arch graces the Dolores River Canyon near the Hanging Flume.