Directly behind the Duomo, this abbey church is noteworthy for its 16th-century mannerist facade and Correggio's magnificent frescoed dome, which was highly influential for its time and inspired many later works. The adjoining monastery is known as much for the oils and unguents that its monks produce as for its Renaissance cloisters. Upstairs, a library is adorned with huge old maps that hang from the walls of a musty reading room.