In the 1950s, two women saved this grand theater in the Colorado mountains from demolition.

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.

The first railway tunnel to cross the Continental Divide and, at 11,523 feet, was once the highest railroad tunnel in the world.

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

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

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.

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

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

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

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

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

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

One of the few surviving Panama Canal steam shovels stands outside a tiny Colorado mining museum.

This enigmatic building features numerous architectural styles.

One of few remaining antique carousels with stationary animals in the U.S.

An antique narrow gauge railway line still running through the Colorado and New Mexico mountains.

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

At one time this small mining village was the highest town in America but now it sits abandoned while the mine churns on.

This sidewalk tribute honors Colorado's great culinary creation.

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

A research lab and hands-on museum where visitors can experiment with retro technology.

The remains of the dam that unleashed a 15-foot wall of water on Denver.