The complex of San Gerardo intramurano or San Gerardino stands on the site where the Monza saint Gerardo had transformed his home into a hospital.
Founded in 1174, the hospital gave assistance to the sick, the poor, and orphans thanks to a precise internal organization and was the scene of several miracles attributed to Gerardo. The small inner church is dedicated to the saint, with Renaissance frescoes but renovated in late Baroque forms as well as the entire complex.
The founder's house, overlooking the Lambro River in a neighborhood formerly characterized by the presence of canals and mills, was reached by a footbridge often swept away by river floods, replaced in 1715 by the stone bridge that still exists.
