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

Nature has shaped this drainage tunnel into the digestive tract of a mighty beast.

This site is home to ancient petroglyphs and pictographs dating back to 6,000 B.C.

These tall, red sandstone pinnacles outside Moab are often forgotten amid their more famous neighbors.

A crack flared at the base provides a pathway completely through a sandstone ridge near Moab.

Few things look more out of place than the electric blue ponds in the reddish-brown desert of Utah.

The fifth-longest natural arch in the world, and the longest outside China.

An antique narrow gauge railway line still running through the Colorado and New Mexico mountains.

Built in 1981 in collaboration with Andy Warhol, this giant piece of pop art stands on the campus of Colorado State University.

This maintained cabin is where Josie Morris, an occasional associate of Butch Cassidy, lived out the last 50 years of her life by herself.

A monument to the egos of two railroad magnates that fell into decline along with their careers.

One of the smallest towns in the United States.

At one time this small mining village was the highest town in America but now it sits abandoned while the mine churns on.

When ecosystems collide in the arid Southwest.

In the middle of a busy airport, a statue honoring the astronaut who told Houston that Apollo 13 had a problem.

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

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

One of the few surviving Panama Canal steam shovels stands outside a tiny Colorado mining museum.

A tribute to Loveland’s most famous sweethearts, who helped spread cupid’s message to millions.

This open-air reconstruction of an Old West town, a cross between a theme park and a museum, provides an immersive historical experience.

A small Wyoming town is home to the state's oldest-operating soda fountain.

An antique Beechcraft airplane serves as a giant windsock for people driving through the blustery open country of eastern Wyoming.

The crumbling structure is a rare surviving relic of the area's bygone mining industry.

Long before guestbooks and hotels, frontier travelers signed their names on this rock face.