This room contains an archaeological excavation that reveals part of the hydraulic system used by the Franciscan friars in the 16th century. The walls also showcase part of the colonial collection from the convent, including oil paintings such as "Christ Crowned with Thorns, The Immaculate Conception, Saint Francis in Contemplation", and "The Holy Death of Saint Francis".

The archaeological section, which focuses on the Postclassic period, presents ceramic objects from the Mexica culture and lithic materials such as a solar disk featuring an image of the sun god Tonatiuh.