This archaeological ruin, located in the Morelos valley, 40 minutes from Tequesquitengo, reached its maximum splendor as a result of the weakening of Teotihuacán. It is considered the cradle of the cult and the deification of the god Quetzalcóatl, of great importance for later cultures, such as the Toltec and the Mexica. The city was built on top of several hills, modified by moats and artificial terraces. The rugged topography of its elevations made it possible to build a fortified city, guarded by watchtowers and with a great Citadel with pyramidal foundations, palaces and ball courts.