ocr: different Teotihuacan was from all other settlements of its time in Middle America. It was here that the New World's urban revolution exploded into being. It had long been clear that the center of Teotihuacan was planned, but it soon became apparent to US that the extent and magnitude of the planning went far beyond the center. Our mapping revealed that the city's streets and the large majority of its buildings had been laid out along the lines of a precise grid aligned with the city center. The grid was established in Teotihuacan's formative days, but it may have been more rigorously exploite ...