The southern portal, dating to 1356, features numerous carved reliefs, portraying scenes from the life of the Virgin Mary on the tympanum and the central column, while on the jambs are the stories of the apostles.

The northern portal (1343) has a tympanum with the Annunciation, the Birth of Christ, the Adoration of the Magi, and the Death and the Coronation of the Virgin.

It includes 35 bronze panels in two series: on the left are scenes from the Old Testament, including the creation of Eve and her meeting with Adam; the Garden of Eden and the Serpent; Moses and the rod transformed into a serpent; the miracle of Aaron upon of the Egyptians' rods; Samson taming the lion and killing the Philistines.

The other series, on the right, depicts episodes from the New Testament: the woman who lost a piece of silver; the Heaven birds; a vineyard, as well as the predecessors of Christ: Melchizedek, Moses, Aaron, David, Judas Maccabaeus and other Prophets.

The southern clerestory has five stained glass windows dated to the late 11th-early 12th centuries, the oldest in Germany:[1] they feature the prophets David, Jonah, Daniel, Moses, Hosea, and were perhaps part of a larger series, the others now being missing.

The southern aisles house more recent medieval stained glass windows (1330–1340), with stories of the Virgin Mary.

The church has also a Romanesque crypt, dating to the 10th century and located under the western choir, and an annexed cloister.