This is the road in Sabino Canyon, of course, but it used to be the creek bed. Really. (A long, long, long time ago.) Stand on the road by the entrance/exit to the Esperero Trail and look out of the canyon. You'll see the hills of silt that were formed by the creek when it flowed along this path. Learn about this and other geological wonders by going on the Gneiss Walk, led by Bruce and the Rockettes, every Thursday at 8.30am. Meet in front of the visitor center.