NOTES: This palace was built by Pope Gregory XIII in 1574 as a summer residence. It served as a papal residence and housed the central offices responsible for the civil government of the Papal States until 1870. It has been the official residence and workplace of the Presidents of the Italian Republic since 1946.
NOTES: Sanssouci was the summer palace of Frederick the Great, King of Prussia, built in 1745-1747 to designs by the Prussian aristocrat and architect, Wenzeslaus von Knobelsdoff. The creation of the Park, organised around several buildings, began soon after the completion of the palace.