Site of the 1879 Cheyenne Outbreak and the site where famed Sioux chief Crazy Horse met his fate.

A rancher expanding a natural spring for his cattle came up with bones – lots and lots of them.

Other-worldly rock formations and ancient fossils abound in this unique stretch of Nebraska badlands.

An experimental, automotive replica of Stonehenge.

This sidewalk tribute honors Colorado's great culinary creation.

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

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

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

It would be easy to walk past this unusual piece of art and have no idea it pays tribute to the odd life of a real chicken.

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

When ecosystems collide in the arid Southwest.

One woman's UFO-themed campground, complete with self-built energy vortexes, UFO-themed weddings, and magic bushes.

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

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

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

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.

Hidden beyond a kitschy giant beetle is this remarkably sprawling collection of preserved insects.

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

Victorian "Fancy Craft" Hair Wreaths and Relics.

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

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

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

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