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

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

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

Each year, teams of the world's best snow sculptors have 65 hours to create frozen masterpieces.

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

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

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

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

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

This iconic science fiction house still looks like something from the future.

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

Community owned and operated, this property is home to a diverse set of nudists.

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

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.

Abandoned silver mine strewn with wrecked and twisted structures.

An architect in Aspen used psychedelics as his muse while building this mushroom masterpiece.

This spectacular track has run continuously since 1882.

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

Despite being one of the most photographed vistas in the Rockies these twin peaks are rightfully known as the "Deadly Bells."

The highest bridge in America was built for an almost unnervingly small amount of money.

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

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.