Overlooking the Colorado Convention Center is this giant sculpture made from thousands of triangles.

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

The largest source of fossilized insects anywhere.

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

When ecosystems collide in the arid Southwest.

The largest self-built castle in the U.S., six decades in the making.

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

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

Over 30 brightly painted Dala horses roam through ‘Little Sweden.’

This tiny old water tower once doubled as a makeshift jail.

This three-dimensional brick mural is the longest of its kind in the United States.

Also known as the Cathedral of the Plains, this church holds the distinction of being one of the "8 Wonders of Kansas."

The grandson of a Kiowa chief created what has become the iconic symbol of a city on the Plains.

A landscape of massive spherical boulders are the main attraction in this Kansas State Park.

Home to Hollywood history and a very special salt crystal.

The largest cattle market on earth holds live auctions open to the public every week.

Tulsa's historic skyscrapers define the oil boom era of Art Deco construction, and are known for their ornate arched lobbies.

This 1930s-era Route 66 Tulsa landmark was moved, restored, and filled with neon.

An indoor botanical garden for tropical plants looks like a giant cylinder lying on its side.

Is this 47.7-mile stretch of highway the longest straight road in the United States?

The only remaining sod house Oklahoma built by a homesteader in 1894.

Located along historic Route 66, this former gas station has been restored and converted into a museum filled with vintage motorcycles.

The only fully-realized skyscraper built by the famed American architect, Frank Lloyd Wright.

A tiny but mighty little pumper sits in the middle of the street, waiting for the next big oil strike.