CSPAN3 Pompeys Pillar National Monument August 25, 2016
They had gotten up, they had hunted. They had seen immense herds of buffalo. He decides to get off the river and walk for a while and see this. This large sandstone outcrop here. I think its just naturally part of Human Interest to want to come to something large, climb up on top of it, and look around. Thats exactly what he did. As part of an explorer, as somebody who was looking to traverse the west, to create maps, to learn about things that are the landscape, the natural history, et cetera, ...
Source: archive.org