The summer presence of the bishops of Augsburg ensured that Füssen would gain an impressive number of baroque and rococo churches. Füssen's Rathaus was once a Benedictine abbey, built in the 9th century at the site of the grave of St. Magnus, who spent most of his life ministering in the area. A Romanesque crypt beneath the baroque abbey church has a partially preserved 10th-century fresco, the oldest in Bavaria. In summer, chamber concerts are held in the high-ceiling baroque splendor of the former abbey's Fürstensaal (Princes' Hall). Program details are available from the tourist office.