Leaning Tower of Pisa
While the bell tower of the cathedral, known as "the leaning Tower of Pisa", is the most famous image of the city, it is one of many works of art and architecture in the city's Piazza del Duomo, also known, since the 20th century, as Piazza dei Miracoli (Square of Miracles), to the north of the old town center. The Piazza del Duomo also houses the Duomo (the Cathedral), the Baptistry and the Campo Santo (the monumental cemetery). The medieval complex includes the above-mentioned four sacred buildings, the hospital and few palaces. All the complex is kept by the Opera (fabrica ecclesiae) della Primaziale Pisana, an old non profit foundation that operates since the building of the Cathedral (1063) to the maintenance of the sacred buildings. The area is framed by medieval walls kept by municipality administration.