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.
Hohenheim Castle
Schloss Hohenheim is a manor estate in Stuttgart, eponymous of the Hohenheim city district. 
The original castle was a fief of the County of Württemberg, recorded for the 12th century. The estate fell into the possession of Charles Eugene, Duke of Württemberg in 1768, who had it re-built as a Rococo style manor with extensive gardens and residential palace for his future wife, Franziska von Hohenheim. The estate was the main ducal residence during 1772–1797, when it fell to the city of Stuttgart.
An "Agricultural Educational Testing and Model Institution" was housed here in 1818, 
and the estate remains in use by the Horticulture and Agriculture Departments 
of the University of Hohenheim.