Hohenzollern Castle
With over 350,000 visitors per year Hohenzollern castle is one of the most visited castles in Germany. The castle is privately owned by the House of Hohenzollern, with two-thirds belonging to the Brandenburg-Prussian branch, and the balance to the Swabian branch. Since 1952, the Princess Kira of Prussia Foundation has used the castle for an annual summer camp for children. Whenever Prince George and his family are staying at the castle, the Prussian flag flies over the castle.
Kyffhausen Castle
The Imperial Castle of Kyffhausen () is a medieval castle ruin, situated in the Kyffhäuser hills in the German state of Thuringia, close to its border with Saxony-Anhalt. Probably founded about 1000, it superseded the nearby imperial palace ("Kaiserpfalz") of Tilleda under the rule of the Hohenstaufen emperors during the 12th and 13th centuries. Together with the Kyffhäuser Monument, erected on the castle grounds between 1890 and 1896, it is today a popular tourist destination.