The church of S. Maria in Organo once faced the waters of the Isolo and was reached by a bridge. It was formerly a Benedictine Abbey that dates to the 7th Century, when it was outside Rome’s protective circle. It became part in the 12th Century and then the monastery passed into the hands of the Olivetans in 1444. It was they who rebuilt the magnificent cloister that is now an elementary school. Sanmicheli added a white marble façade to the Gothic Romanesque structure in the 16th Century.