Oranienburg Palace is one of the earliest Baroque palaces in the Brandenburg-Prussian lands, built for Electress Louise Henriette in the 1650s and expanded by her successors over the following decades. The current building is a substantial U-shaped baroque structure facing the Havel, surrounded by a formal park. After suffering damage and neglect through various 20th-century uses — including a period as a chemical weapons factory and later a pharmaceutical plant — the palace has been carefully restored and now houses the Oranienburg district administration and a small museum on the building's history.
The museum traces the palace from its Dutch-influenced origins through its imperial expansions to its dark 20th-century incarnations. The park along the river, Schlosspark Oranienburg, is open to the public and makes for a good walk regardless of whether you enter the building. The palace is a short walk from the town centre and the S-Bahn station.