This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

This geothermal hot spring hides beneath a slowly growing mineral dome.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

A house carved into a rock in the 1940s.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

An annual festival celebrating Colorado's most famous frozen corpse.

While most of the games in this arcade take quarters, that would have been a small fortune when they were made.

A collection of over 15,000 zines works to preserve DIY publishing culture.

A small horde of mythical creatures lurk almost imperceptibly within the museum's wildlife dioramas.

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

A collection of fading fantasy tchotchkes lines this dirt road in the Colorado wilderness.

The world's largest key collection features keys to the White House, Frankenstein's castle, and Hitler's bunker.

The scene of one of the darkest moments in American labor history has been left essentially untouched since the tragedy.

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

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

The largest source of fossilized insects anywhere.

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

Gleaming self-built castle towers made from beer cans and inspired by "Vitamin Mary Jane."

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.

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

See six states, pickled freaks, rocks, and antiques.