Santo Tomás Ajusco was founded in the early colonial period. Ajusco refers to the many fresh water springs which flow on the side of the Ajusco Mountain. The center of the town has a single nave church with a sculpture of Saint Thomas sculpted in wood, a crucifix made of ivory and an 18th-century sculpture of Saint James on horseback inside. The façade has three portals in sandstone with the center one decorated in plant motifs. The face also has three low reliefs. The atrium is paved with rock taken from the Tequipa pyramid. The feast day of the patron saint is 3 July.