Map of the extraterritorial property of the Holy See in Castel Gandolfo as established by the Lateran Treaty and subsequent agreements1 Papal palace with adjacent garden2 Garden of the Villa Cybo3 Villa Barberini (a) and adjacent gardens, summer seat of the Pontifical College Urbano (b), papal farm (c) and the Convent of the Poor Clares (d)4 Olive grove called "ex-Bacelli"5 Church of San Tommaso di Villanova and adjacent rectorye Cemetery of Albano Laziale Papal Heliport
http://sharemap.org/mathbau/Extraterritorial_property_Castel_Gandolfo
Geospatial data sources: 

Open Street Map Data (ODbL) - http://www.openstreetmap.org/copyright
Annex 5 of the Lateran Treaty (1929)
Agreement between the Holy See and Italy on a new delimitation of the exterritorial zone of the Papal villas in Castel Gandolfo - Albano Laziale (1948)
Annex of the Law on the Ratification of an Exchange of Notes between the Holy See and the Government of Italy (1981)
Gugganij