This prison-turned-museum is a remnant of the Old West's grizzly, violent past.

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

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.

The remnants of a 1970 plane crash remain high in the Rocky Mountains.

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.

This fully restored synagogue explores the American Jewish experience along the old frontier.

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

Overlooking the Colorado Convention Center is this giant sculpture made from thousands of triangles.

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

This enigmatic building features numerous architectural styles.

A glimpse of a waterfall is reached by a steel catwalk along a slot canyon located in an Ouray city park.

This National Natural Landmark is one of the best examples of a “mass wasting” in the world.

Paleoamericans built these ancient walls high in the Colorado Rockies as part of an extensive hunting system.

The site of a defunct mill, that once supplied marble for the construction of the Lincoln Memorial.

This old train trestle and collapsed tunnel once allowed the railroad to negotiate the steep slopes of the Colorado Rockies.

This massive home was constructed by one of the greatest conservationists in Colorado history.

Once a lonely sentinel on the edge of the Great Plains, this rebuilt trading fort offers a glimpse of life on the Santa Fe Trail.

The remains of an early 1900s dude ranch that operated until the 1970s.

A seven-story 1920s mausoleum outside Denver houses thousands of remains.

The largest dinosaur trackway in North America is tucked away among this canyon's ghosts and archaeological gems.

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

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

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 tea house was a hand-built gift from Boulder's sister city in Tajikstan.