The millennial presence of pyramids, obelisks, arenas, temples, concrete evidence of man’s ability to use stone in constructions, and of the suitability of this material for the purpose, makes their existence seem ordinary and everlasting. But if we ask ourselves how these structures, these genuine engineering masterpieces of their time, were accomplished, starting with the transportation of the building materials...
http://blog.lithosdesign.com/stone-gate-and-verona-arena/
