Most-visited and most-photographed slot canyon in the American Southwest.

One of the ghostly stops along Route 66.

These millipedes glow not out of attraction, but as a not-too-subtle warning.

Quite simply the largest tree in the world (by volume).

The remains of a historic ranch house that witnessed the Civil War battle dubbed the “Gettysburg of the West.”

Despite time, colonization, and the brutal New Mexican heat, these Pueblo ruins still stand.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

A multi-storied adobe complex has been inhabited for more than a thousand years.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

The largest dinosaur trackway in North America is tucked away among this canyon's ghosts and archaeological gems.

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

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

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

One of the largest Buddhist stupas in North America is built of concrete designed to last 1,000 years.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

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

When ecosystems collide in the arid Southwest.

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

Silver in the hills led to the speedy creation of this boom town and a lack of it saw the town abandoned nearly as quickly.

Abandoned silver mine strewn with wrecked and twisted structures.

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

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

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

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