Sacsahuaman
was supposedly completed around 1508. Depending on who you listen to, it
took a crew of 20,000 to 30,000 men working for 60 years.."....this fortress surpasses the constructions known as the seven wonders of the world. For in the case of a long broad wall like that of Babylon, or the colossus of Rhodes, or the pyramids of Egypt, or the other monuments, one can see clearly how they were executed...how, by summoning an immense body of workers and accumulating more and more material day by day and year by year, they overcame all difficulties by employing human effort over a long period. But it is indeed beyond the power of imagination to understand now these Indians, unacquainted with devices, engines, and implements, could have cut, dressed, raised, and lowered great rocks, more like lumps of hills than building stones, and set them so exactly in their places. For this reason, and because the Indians were so familiar with demons, the work is attributed to enchantmet.."