The Münster rises from the highest point of the old town, its Romanesque foundations dating to the eleventh century and its tower added in the fifteenth. The interior is a mix of periods — Romanesque crypt, Gothic nave, Renaissance chapels — and the whole thing survived the war intact, which gives it a completeness you rarely find in German church architecture.
The tower is climbable and earns its effort: from the top you get the full picture of the old town's rooflines, the lake stretching east, and on a clear day the Swiss Alps on the far shore. The Münster also played a direct role in the Council of Constance — some of the key sessions were held here, including the ceremony at which the new pope, Martin V, was elected in 1417.