This formation is sacred to the native people that live in this area, and they will tie praying cloths in the trees, as you can see above. There were signs telling you to stay on the paths since the area was sacred. There has been controversy regarding allowing climbers to scale the sides of Devil's tower because of that but it is allowed.
Below, I took this photo as we were leaving with the red rock in the foreground. It had been raining all morning, so we were very happy to see this blue sky!