It was the most important civic-religious space of the place, since in its center is the Adoratory of the Stela of the two Glyphs, same that gives its name to the square. It is a large rectangular slab on which is engraved the date “10 caña”, day “9 ojo de reptil”, which must have corresponded to a very important moment in the life of the Xochicalca people (the original of the stele is under safeguard in the Museum of Site). The plaza is delimited by two porticoes, buildings C (east), D (west) and the northeast structure. These three constructions are erected on a foundation of a single body with its temple on top. To the north of the plaza is located the Great Pyramid or Structure E, the largest and most important building of Xochicalco, which consists of a platform of three bodies on which is another foundation of four bodies, where the remains of a substructure can be observed. On top of the latter was a temple built with adobe.

Great Pyramid: This is the largest construction of Xochicalco and consists of two levels. In the center of both bodies there are two large staircases with alfardas and in the upper body there are remains of an older building. In the highest part of the last body there are the vestiges of what could have been a great temple.