Located in the historical, artistic and cultural center of Siena, the Cathedral is an example of Italian Roman and Gothic churches. As one of the largest churches in Italy, Siena Cathedral is still a church that is not fully completed according to its design. The marble floor in the church depicts history and biblical stories. These 56 floors were completed by many artists. The earliest sculpture was made of white carved marble filled with black stucco. The precious floor is only in Exhibited at certain times of the year. The exterior walls of the building are dominated by stripes of white and dark green marble, and the front is decorated with ornate façade statues, but most of these are replicas, and the originals are kept in the Opera Museum in the cathedral. The stained-glass windows in the cathedral are also very beautiful, but the important one from Duccio di Bonissegna is now in the Opera Museum. The Piccolomini Family Library (Libreria Piccolomini) is another highlight in the cathedral, with a series of frescoes depicting Piccolomini's life, which is very impressive. Next to the library is the Baptistery of St. John (BattisterodiSanGiovanni). The frescoed crypt (Cripta), located below the pulpit, was not discovered until 1999. Cathedral Opera Museum The Cathedral Opera Museum (Museodell'Opera) is one of the earliest private museums in Italy. The location of this church should be the original design of the nave corridor, but because it was not completed, a wall was built into a museum. Many original works of art in the cathedral are collected in the museum, and from here, you can climb the 131 stairs to reach the half-built vertical wall (Panoramadal Facciatone) to enjoy the panoramic view of the whole cathedral. Church masterpieces Some masterpieces in the cathedral: P. Lorenzetti (PietroLorenzetti): "Birthof the Virgin" (Birthof the Virgin), Duccio di Buoninsegna (Ducciodi Buoninsegna): "Sacred Cathedral of Siena" "(Maestà del Duomo di Siena), Donatello (Donatello): "Madonna of Forgiveness", are stored in the Cathedral Opera Museum.