Mark Klett and Byron Wolfe. Rock formations on the Road to Lee's Ferry, Arizona, 2008. Left inset: William Bell, 1872. Plateau North of the Colorado River near the Paria. (courtesy National Archives) Right inset: William Bell, 1872. Headlands North of the Colorado River. (courtesy National Archives)When I first heard of this exhibition, I had my doubts. Which was pretty silly of me. I mean, you can't really go wrong with the Grand Canyon. There's just no denying that it kicks butt.The concept fo