“Keep moving” ordered a voice deep from the abyss, as a length of people, as far as the eye could see, tried to avoid bashing their heads on the ancient rocks above them. Sweat dripping from my brow, ...

The Great Pyramid of Giza might get all the headlines, but it wasn't humanity’s first monumental effort. Long before pharaohs were stacking limestone in Egypt, people across the world were carving ...