Layers of stone blocks leading up the the peak of the Pyramid of Khufu (Cheops). Being at the base of the pyramids, one really appreciates what a mad endeavour they were, transferring so much stone out into the desert, to build giant mounds for small chamber tombs.
Despite the crowds, there is still a timeless quality to the Pyramids, with their weathered stone in the greyish, dust-filled Cairo sky. The camel-drivers who offer rides dress in a traditional manner, and I think this photo could have easily been taken in the nineteenth century (I have made an alternate version following that line of reasoning).