underneath the city. Numerous highly important religious educational institutions are also in Rome, such as the Pontifical Lateran University, Pontifical Biblical Institute, Pontifical Gregorian University, and Pontifical Oriental Institute. Since the end of the Roman Republic, Rome is also the centre of an important Jewish community, which was once based in Trastevere, and later in the Roman Ghetto. There lies also the major synagogue in Rome, the Tempio Maggiore. Vatican City The territory of Vatican City is part of the Mons Vaticanus (Vatican Hill), and of the adjacent former Vatican Fields, where St. Peter's Basilica, the Apostolic Palace, the Sistine Chapel, and museums were built, along with various other buildings. The area was part of the Roman rione of Borgo until 1929. Being separated from the city on the west bank of the Tiber, the area was a suburb that was protected by being included within the walls of Leo IV, later expanded by the current fortification walls of Paul III, Pius IV, and Urban VIII. When the Lateran Treaty of 1929 that created the Vatican state was being prepared, the boundaries of the proposed territory were influenced by the fact that much of it was all but enclosed by this loop. For some parts of the border, there was no wall, but the line of certain buildings supplied part of the boundary, and for a small part a new wall was constructed. 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. Pilgrimage Rome has been a major Christian pilgrimage site since the Middle Ages. People from all over the Christian world visit Vatican City, within the city of Rome, the seat of the papacy. The city became a major pilgrimage site during the Middle Ages. Apart from brief periods as an independent city during the Middle