The largest source of fossilized insects anywhere.

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

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

The childhood home of Henry Jones Jr. is now an adventure-themed bed and breakfast.

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 super steep hike ascends 2,000 feet in less than a mile.

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

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

This spectacular track has run continuously since 1882.

This Colorado hiking trail provides a small gold mine of abandoned gold mines.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

When ecosystems collide in the arid Southwest.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

The largest self-built castle in the U.S., six decades in the making.

This naturally-sourced hot spring is now home to a clothing-optional resort.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

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

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

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

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

Neal Cassady may still have an open tab at one of Denver's oldest watering holes.

The huge collection of paintings of the American West is one of Denver's best-kept secrets.

Wall to wall taxidermy at Denver's oldest and most exotic steakhouse.

This modern antique shop is a museum for 1980's Saturday morning cartoon culture.