This is the 10th issue in the award winning series: Holy Windows. ith ultra high relief HiRe minting in 999 silver the relief comes out of the coin. A window inserted with a beautiful image of Maria. 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 center 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.