The Sauerland Museum is the regional museum for the Cologne domain of Sauerland, the former Duchy of Westphalia. The old building with historic Landsberger Hof, a former seat of nobility, opens after reconstruction and renovation in the summer of 2018 with a completely redesigned permanent exhibition dedicated to the former Duchy of Westphalia. The new building with three floors for future temporary special exhibitions opens its gates in the summer of 2019. In addition to the exhibitions, the new building will also host various other cultural events.
The Sauerland Museum has extensive collection holdings covering the former Duchy of Westphalia. Because this region was attached to Prussia in 1816 the collection also contains exhibits concerning Prussian history. Notable in this respect are e.g. the life-size portraits of King Frederick William III, King Frederick William IV, Emperor William I and Emperor Frederick III. Also worthy of mention is the model of the classical Neumarkt, and Ludwig Freiherr von Vincke's work chair.