The last sunlight of the day shines on Agathla (Aghaałą́, aka El Capitan), a volcanic plug (diatreme) on the Navajo Nation just south of Monument...

Arizona is a phenomenal place. This mountainous structure is just on the outside of Monument Valley. A monsoon storm was blowing in as I approached...

One of several volcanic plugs located in the southern part of the Colorado Plateau, Agathla (El Capitan) rises 1500 feet (460 m) abve the surrounding...