Just outside of Flagstaff, Arizona, there is a protected area known as Sunset Crater. The ground is covered in soft black volcanic ash, crevasses and fissures can be explored.
Start along the boardwalk to get a sense of the area, then head out on a trail that will lead you up and around a mountain.
I come around the mountain and back down as the sun starts to set in the west. I head back to camp, start a fire and watch the night sky unfold.

Another peaceful starry Arizona night.