As a trace of the oldest architecture of the monastery founded in 936 is a capital from the 10th/11th century. Built at the beginning of the 12th century, the three-nave basilica with its rare crossing tower and staggered choir was badly desecrated after the Reformation. Nevertheless, the preserved nave with its Lower Saxon alternation of columns still shows excellent architectural sculpture. The cube capitals and the arcade zone with animal figures, interlace bands and foliate friezes refer to Lombard stonemasonry. The highlight is the replica of a relief from 1170 as the most important example of the late period of the austere style.