The Gallery of Maps: topographical maps of the whole of Italy, painted on the walls by friar Ignazio Danti of Perugia, commissioned by Pope Gregory XIII (1572–1585). This gallery is situated at the west side of the Belvedere Courtyard. It is 120 m long. It took Ignazio Danti three years (1580–1583) to complete the 40 panels. The decorations on the vaulted ceiling is the work of a group of Mannerist artists (such as Cesare Nebbia and Girolamo Muziano).