Collection of skeletal systems from the "world's leading supplier of osteological specimens."

A monument to the center of the North American continent may be off by a few miles.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

Legends surround this jagged rock formation in the New Mexico desert.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

To find the "unicorns of the deep" you've got to go downstairs.

An enthusiastically interactive mining museum that won't let black lung ruin the fun.

An eclectic collection of artifacts from the Wild West is preserved in a remote fictional pioneer town.

A mental health hospital dating back more than 139 years, now features a museum.

A downtown park built on top of unclaimed graves.

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

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

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

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

When ecosystems collide in the arid Southwest.

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

See massive fossils that are over 200 million years old in northeastern Arizona.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

Auburn's iconic eagle flight goes back to a 19th century eagle that dropped dead on the field after inspiring the football team to victory.