Teotihuacan means “city of the gods”. Now the city is deserted, but once it was inhabited by more than two hundred thousand people. The layout is striking: the regular lines of streets form quarters and at the same time are strictly perpendicular to the main avenue. In the center of the city there is a huge square with massive pyramids on platforms. Teotihuacan was built according to an elaborate plan and prospered. But in the 7th century it was abandoned. Why is unclear. Either because of a foreign invasion, or because of a popular uprising.