Pyramid of the Moon, Teotihuacan

From above, the plan of Teotihuacan makes sense: the Pyramid of the Moon closes the north end of the Avenue of the Dead, with the mountain Cerro Gordo rising directly behind it. Smaller than the Pyramid of the Sun, it was enlarged in seven building stages between about 100 and 450 CE, and excavations found sacrificial burials sealed inside several of those layers, offerings that marked each new enlargement.