The Devil’s Tower is an astonishing geologic feature that protrudes out of the rolling prairie surrounding the Black Hills. It is the first national monument in the country, established in 1906. This site is considered Sacred to the Lakota and many other tribes that have a connection to the area, according to the NPS. Hundreds of parallel cracks make it one of the finest traditional rock climbing areas in North America. Scientists agree that giant rock formed as a result of the intrusion of igneous material, but how that happened is not clear.