It was originally a medieval hill castle initially jointly owned by the Prince Bishop of Cologne and the Count of Nassau.
The complex is first mentioned in a document dated 2nd September 1259 in the name of Bishop Henry of Liège as burch inde der stad zen Sigin.
[2] In 1888 the city of Siegen bought the Obere Schloss from the Kingdom of Prussia for 30,400 marks[3] and established the Siegerlandmuseum of regional history there in 1905.
[5] Its mission was stated to be to "present the essence of the Siegerland homeland in terms of history, culture and folklore".
Other rooms are dedicated to famous people from Siegerland, such as the writer and doctor Johann Heinrich Jung-Stilling and the musical Busch brothers.