The underground sanctuary dedicated to Sant'Efisio and San Gregorio Magno is structured in two environments that were originally separated by a railing: the vestibule and the sanctuary. In the first, rectangular with a barrel vault, five niches per side House busts of Saints connected with the Franciscan tradition. In the second environment, always rectangular and barrel vaulted, numerous altars and sacred images in polychrome stucco created by Mutoni and Corbellino. The tempera in the vault were carried out by Aking.
The Oratory of San Michele Arcangelo was built between 1758-1759 on models im