A multi-storied adobe complex has been inhabited for more than a thousand years.

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

When ecosystems collide in the arid Southwest.

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

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

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 Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

A downtown park built on top of unclaimed graves.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

The largest source of fossilized insects anywhere.

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

Victorian "Fancy Craft" Hair Wreaths and Relics.

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

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

Strange red rock formations that have been attributed to a higher power for hundreds of years.