The city reached its peak in 450 CE, when it was the center of a powerful culture whose influence extended through much of the Mesoamerican region. At its peak, the city covered over 30 km (over square miles), and perhaps housed a population of 150,000 people, with one estimate reaching as high as 250,000. Various districts in the city housed people from across the Teotihuacano region of influence, which spread south as far as Guatemala. Notably absent from the city are fortifications and military structures.