The territory includes Saint Peter's Square, separated from the territory of Italy only by a white line along with the limit of the square, where it borders Piazza Pio XII. St. Peter's Square is reached through the Via della Conciliazione, which runs from the Tiber to St. Peter's. This grand approach was designed by architects Piacentini and Spaccarelli, on the instructions of Benito Mussolini and in accordance with the church, after the conclusion of the Lateran Treaty. According to the Treaty, certain properties of the Holy See located in Italian territory, most notably the Papal Palace of Castel Gandolfo and the major basilicas, enjoy extraterritorial status similar to that of foreign embassies.