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

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

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

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.

Hidden beneath a bridge, this waterfall is known for the large amounts of graffiti painted on its base.

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

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

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

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.

Inspired by a music box, a small town Vietnam vet carved an entire carousel full of animals by hand.

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