The Piazza dei Miracoli (; ), formally known as Piazza del Duomo (), is a walled 8.87-hectare area located in Pisa, Tuscany, Italy, recognized as an important centre of European medieval art and one of the finest architectural complexes in the world. Considered sacred by the Catholic Church, its owner, the square is dominated by four great religious edifices: the Pisa Cathedral, the Pisa Baptistry, the Campanile, and the Camposanto Monumentale ("Monumental Cemetery"). Partly paved and partly grassed, the Piazza dei Miracoli is also the site of the "Ospedale Nuovo di Santo Spirito" ("New Hospital of the Holy Spirit"), which houses the Sinopias Museum () and the Cathedral Museum ().