Two crossing towers, two transepts flanked by stair towers, and two chancel structures hint at the alignment after clear mathematical principles, even if told from the exterior alone.

The founder, bishop Bernward (993 – 1022 a.D.) wished to mirror the beauty of the divine order in this way.

Outstandingly fine are the furnishings of the 12th and 13th centuries. The rich stuccatures represent the most extensive ensemble of their kind north of the Alps.

The painted wooden ceiling (approx. 1230 a.D.), almost 30 meters in length and depicting the genealogical tree of Christ, is the most monumental work of its kind in all of Europe.