An acoustic anomaly with a mysterious cause.

This museum offers an actual time machine back through Colorado's past.

At the tallest peak in Colorado, an electrifying mix of thin air, lightning, and rivalry.

The highest paved road in North America winds its way up Mount Blue Sky in Colorado to an altitude of 14,130 feet above sea level.

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

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

When ecosystems collide in the arid Southwest.

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

Three markers installed over the course of 140 years mark the point where Arkansas, Missouri, and Oklahoma converge.

A large stone map of Arkansas awaits visitors to its highest point.

Giant granite rocks standing end-to-end like a train of circus elephants.

European castle ruins in an American state park are actually the product of death and grief.

In the St. Francois Mountains in the Ozarks at 1,772 feet above sea level, Taum Sauk Mountain is the highest (and possibly oldest) peak in Missouri.