Filming locations in Rome included the piazza at the Basilica di Santa Maria in Trastevere , Tiber Island , the piazza and column outside San Bartolomeo all'Isola , the Pons Fabricius northeast of Tiber Island , Esquiline Hil l , the Fountain of Neptune at Piazza Navona , and the fountain at the south end of Via del Mascherone near Via Giulia .