The Rosgartenmuseum is Konstanz's city and regional history museum, housed in a former guildhall in the old town. Its collections cover local life around Lake Constance, religious history, trade, and the civic world that made Konstanz more than a pretty lakeside stop.
It is a useful museum after you have seen the cathedral and wandered the lanes. The displays give context to the council city, the lake economy, and the borderland feel that still shapes Konstanz today.