The parish church of St Gallus is the main church of the lower town, a large baroque building that replaced an earlier medieval structure. The current building dates substantially from the 17th and 18th centuries, with a tall tower that serves as a local landmark. The interior has the characteristic warmth of Austrian provincial baroque — gilded altars, painted vaults, and an overall confidence that the decoration earns rather than overwhelms.
The church is dedicated to St Gall, the Irish monk who founded the monastery at St Gallen in Switzerland just across the Rhine in the 7th century. It sits a few minutes' walk south of the lakeside on the edge of the modern town centre. The interior is accessible during the day outside services and takes about fifteen minutes to appreciate.