"The artistic patrimony of the Holy See, located in the Vatican and in some extraterritorial areas in the city of Rome and the Roman hills (Castelgandolfo) have inestimable religious, historical and cultural value.The Lateran Treaty with Italy (1929) and the inclusion in the World Patrimony of Vatican City (1984) and the extraterritorial property of the Holy See (1990) safeguard and protect the integrity of this patrimony."