Add Yahoo as a preferred source to see more of our stories on Google. A man rides a horse in front of the Giza pyramids on the outskirts of Cairo, Egypt (Getty Images) “Keep moving” ordered a voice ...

“Keep moving” orders a voice deep from the abyss, as a length of people, as far as the eye can see, try to avoid bashing their heads on the ancient rocks above them, me included. Sweat dripping from ...