Located on the edge of the historic center of Rome, the square is part of the Vatican City and delimits the border with the Italian state The famous square, a remarkable example of Baroque architecture and urban planning, is dedicated to the homonymous saint and is a daily meeting point for thousands of Catholic faithful from all over the world. St. Peter's Basilica in the Vatican, officially the papal major basilica of St. Peter's in the Vatican, is a Roman Catholic basilica in Vatican City; symbol of the Vatican State, crowned by the monumental Piazza San Pietro. St. Peter's basilica is the largest of Rome's four papal basilicas and is often described as the largest church in the world