After climbing the pyramid, there are 48 steps extending up to the church atrium. The atrium cross is placed near the main gate. It dates from 1666 and is identical to the atrium crosses at the San Gabriel Friary and the church of San Miguel Tianguisnahutl. The atrium is small, but its position at the top of the pyramid affords views of the Popocatepetl and Iztaccíhuatl volcanoes, the flat valley floor and the large number of church cupolas that dot the city. The exterior of the church is plain but has a dome covered in multicolored tiles from Puebla.