Historic, 19th-century wagon wheel ruts cut into soft volcanic ash.

A hotel with a rich Wild West history of miners and bootleggers.

The site of a defunct mill, that once supplied marble for the construction of the Lincoln Memorial.

Paleoamericans built these ancient walls high in the Colorado Rockies as part of an extensive hunting system.

The giant stump of the once towering cottonwood where Ute people held tribal meetings.

Central City celebrates its most famous madam by racing beds down Main Street.

Two creeks flow out of either end of this canyon in opposite directions.

The remains of a World War II-era Japanese American internment camp dot a windswept Colorado hill.

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

Neal Cassady may still have an open tab at one of Denver's oldest watering holes.

This otherwise unremarkable ski town building marks the site of Butch Cassidy's first robbery.

It's easy to forget what century it is as you wander this rustic homestead.

One of few remaining antique carousels with stationary animals in the U.S.

A river runs through this remote valley in a very unexpected way.

Unlike most arches, this geological oddity formed in a volcanic dike.

This interpretive path lets you get up close and personal with dinosaur bones.

This eclectic collection documents the wild legacies of "America's Wickedest Street."

The burial grounds of a secret society includes fences topped with fake Tesla balls.

Victorian "Fancy Craft" Hair Wreaths and Relics.

A lively annual event in which thousands of people race to push coffins heavy with bodies up a hill.

Final resting place of a 19th century gold prospector and convicted cannibal.

This was once the home of Gahan's Saloon, Denver's most storied speakeasy.

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

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