When zealous marijuana enthusiasts kept stealing the "Mile 420" highway marker, the State of Colorado got creative.

Two tall rocks sit at the center of this site, once the home of a large Ancestral Puebloan community.

An environmental art installation inspired by farmhouses and crop circles.

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

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.

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

Isak Heartstone, a 15-foot wooden troll made out of recycled materials.

A museum dedicated to the mysterious cryptid.

Birds with backpacks expedite film development for a rafting company on a remote Colorado river.

An impressive collection of over 50,000 minerals including moon rock from the Apollo 17 mission.

The moving metal works of one troubled artist can still be viewed on his front lawn... for now.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

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

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

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

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

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

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

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

This spectacular track has run continuously since 1882.

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

This "zoo" is a cross between a junkyard and a sculpture garden, featuring animals you won't see anywhere else.

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

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