The Schloss in Cottbus marks the site of the city's old castle, first mentioned in the 10th century. The complex now serves as a courthouse, but the castle hill and the tall tower still give this corner of town a strong historic presence.
You are coming for the exterior rather than a castle tour. It works well as part of a walk through old Cottbus, especially combined with the nearby museums, churches, and river paths. The spire is the feature to look for from a distance.