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

A mental health hospital dating back more than 139 years, now features a museum.

Climb to the top of this spiritual tower, and you'll be rewarded with spectacular views.

The final resting place of American icon Buffalo Bill, and a museum that aids in telling his tale.

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

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

The wreckage of a World War II bomber is hidden high 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.

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

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

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

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.

The world's largest carnivore sanctuary is home to over 450 meat-eating rescues.

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

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

This spectacular track has run continuously since 1882.

Explore some of the most unique vehicles in history along with a cast of unsettling mannequins.

A small horde of mythical creatures lurk almost imperceptibly within the museum's wildlife dioramas.

Rather than a run-of-the-mill franchise hotel, this lodging has been decked out in dinosaur decor.

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

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

A prehistoric rock shelter that's literally in someone's backyard.

This enigmatic building features numerous architectural styles.

The haunted reputation of these abandoned Colorado train tunnels is probably not helped by the terrifying spiked fence.