The Vatican City is a roughly triangular tract of land within Rome, on the west bank of the Tiber River and west of the Castel Sant'Angelo. In its southeast corner is the piazza of Saint Peter's Church, surrounded by the splendid colonnade. North of the piazza is a quadrangular area containing administrative buildings and the Belvedere Park. West of Belvedere Park are the pontifical palaces, and beyond the palaces lie the Vatican Gardens, which make up half the area of the little state. The Leonine Wall forms the western and southern boundaries.
In the city of Rome are certain important basilicas, churches, and other buildings to which the Italian government extends the rights of extraterritoriality and tax exemption but not papal sovereignty. The basilicas include San Giovanni in Laterno (St. John Lateran), Santa Maria Maggiore (St. Mary Major), and San Paolo fuori le Mura (St. Paul outside the Walls). The palace of San Callisto at the foot of the Janiculum also shares the immunity of the Vatican, as does the papal summer residence at Castel Gandolfo, in the Alban Hills outside Rome.
Vatican City has its own citizenship, issues its own currency and postage stamps, and has its own flag and a large diplomatic corps. It is open to visitors all year, and the pope receives callers in public and private audiences. It has its own newspaper ( Osservatore Romano ), railroad station, and broadcasting facility (first established by Marconi under Pius XI). The seven Vatican universities, including the Pontifical Gregorian Univ., are located in Rome. The political freedom of the Vatican is guaranteed and protected by Italy.