thumb|254x254px|Plaque claiming extraterritoriality on the door of the [[Lateran Palace, Rome.]]

The properties of the Holy See are regulated by the 1929 Lateran Treaty signed with the Kingdom of Italy. Although part of Italian territory, some of them enjoy extraterritoriality similar to those of foreign embassies, including tax exemptions. Nonetheless, those visiting these properties are generally required to follow the immigration rules of Italy. For example, American seminarians at the Pontifical North American College need an Italian visa, despite residing, and studying, in extraterritorial property of the Holy See.

Outside Vatican City but inside Rome

Extraterritorial property

  • Archbasilica of Saint John Lateran (Arcibasilica di San Giovanni in Laterano)
  • Basilica of Saint Mary Major (Basilica di Santa Maria Maggiore)

Outside Rome

thumb|275px|Extraterritorial property of the Holy See in [[Castel Gandolfo:<br>

1. Papal palace with adjacent garden<br>

2. Garden of the Villa Cybo<br>

3. Villa Barberini, gardens and agricultural area<br>

4. Oliveto ex-Bacelli<br>

5. Church of San Tommaso di Villanova]]

Extraterritorial property

  • Palace of Castel Gandolfo, the Gardens of the Villa Cybo, Villa Barberini plus adjacent gardens, the summer estate of the Pontificio Collegio Urbano di Propaganda Fide and the papal farm between the towns of Castel Gandolfo and Albano Laziale (around ).
  • Area of Santa Maria di Galeria, where the antennae of Vatican Radio are located. The area was ceded by Italy to the Holy See in an agreement in 1951.