The founding (200 BC – 100 CE)
Around the time Rome was consolidating the Mediterranean, a settlement in the northeast Valley of Mexico grew rapidly along a broad north–south avenue. Its founders left no written record and are still unknown by name. Within two centuries they had laid out a grid unlike anything else in the Americas and had begun the first construction of the Pyramid of the Sun.
The classic city (150 – 450 CE)
By 150 CE Teotihuacán was one of the largest cities on Earth: an estimated 100,000–125,000 inhabitants living in 2,000 walled apartment compounds, most decorated with murals in reds and greens still visible today. It traded obsidian, pottery, and green stones as far as the Maya heartland. The Pyramid of the Sun, the Pyramid of the Moon, and the Temple of the Feathered Serpent all took shape in this period.