Schloss Oldenburg stands in the centre of the city of Oldenburg in Germany and served as the residence of the Counts, Dukes and finally, the Grand Dukes of Oldenburg. The oldest part dates from 1607 and it was Anthony Günther, Count of Oldenburg who wanted to develop the medieval buildings into a palace with four wings. The last parts of the medieval castle were demolished in the 18th century.
The Grand Duchy of Oldenburg came to an end in 1918 with the abdication of Frederick Augustus II, Grand Duke of Oldenburg and in 1923 the building was converted into the State Museum of Art and Cultural History in Oldenburg (Landesmuseum) which still uses the Palace today.
Schloss Oldenburg still displays some of its royal history, though it is not the main focus. When I visited, they had an exhibition on Franz Radziwill, which wasn’t really my taste. Some of the information is also offered in English but not all of it. I loved learning that the Marble Room was where Amalia married King Otto of Greece, that is what brings the rooms alive and I am sure this palace has plenty more stories like that. Perhaps they could expand on this some more. You can buy a day ticket for all three buildings of the Landesmuseum, which includes the Prinzenpalais (also a former royal residence) and the Augusteum (the royal art gallery).