Exterior view

Under Johann Nikolaus von Steengracht from 1854 to 1862 a remodeling of the exterior of the medieval castle was done in the Gothic Revival style. The Baroque interior was maintained largely untouched during the work under the Cologne Cathedral architect Ernst Friedrich Zwirner. The castle walls were covered with red brick and the three corner towers were fitted with battlements and pointed windows. The keep was set up with a historicist pointed roof. The gateway also experienced a reorganization and was made accessible via a newly built stone bridge.