al-spudnik: “ Holy crap, the Antikythera Mechanism. This was an ancient Greek computer - yes, computer - likely designed by Archimedes himself for predicting the movements of the heavenly bodies. Later refined and miniaturized over the centuries,.
28 Large Stone Boxes in the underground Serapeum at Saqqara are made of granite, presumably brought from Aswan which is 500 miles away. The lid was cut from the same block as the box itself, and the two combined weigh more than 80 tons