Sunrise seen from Mesa Arch in Canyonlands National Park, Utah, is a spectacular affair. The shape of the rock face below the arch forms a reflector which bounces warm light straight up to illuminate the underside of the arch.
I took this shot a couple of years ago on our NxNW expedition to the Moab area and I’m pretty sure this was the busiest of the locations we shot. Even arriving at 5am to catch the late April sunrise, there was already a line of photographers waiting with tripods set up along the line of the arch. It may look huge in these pictures but, in real life, the arch opening is only about 25 or 30 feet wide and a dozen photographers can easily fill that gap!
For the technically inclined...