A National Monument NOT to be missed. Admission was $10 per car. There was a little drive to the visitor's center, which took about 5 minutes. The rock formation, Devil's Tower, is an awesome sight and one you will want to take a lot of time to take in.
There is a paved path, which is at an easy grade after the first climb, that would take about 3 hours to walk around the base of the Tower. Views of the valley below can be seen along the way. If you decide to make that trek make sure you have water and good walking shoes.
This review is the subjective opinion of a TravelPod member and not of TravelPod.com.