As promised yesterday, I'm sharing the image of Mesa Arch lit up underneath. I promise this is the last one I will be sharing before moving onto a different subject.
This is the reason people line up in the dark to shoot here. On the opposite side of this arch is about a 1200 foot drop. That drop is part of what is known as a "bowl" in the rocks. When the sun rises, it hits that bowl directly and the reflected light lights up the underside of the arch with this nice, warm light. It is something to see, for sure.
Aperture Priority, 1/10th second, F/16, ISO 100, 15mm
If you look closely at this image, in the distance you can see a formation known as Washer Woman. Washer Woman is actually a desert tower and an arch. It gives the illusion that a woman is reaching her hands into a tub. The "woman" part of the formation creates the tower and the "reaching into the tub" part creates the arch.
This image was made with my Canon 5D Mk III and Tamron 15-30mm Lens resting atop my Sirui Tripod and K-40X Ballhead.