The Piazza del Duomo is Milan's main square. The Milan Cathedral, Galleria Vittorio Emanuele II and Royal Palace (Palazzo Reale) are all located on this famous city square. While the piazza was originally created in the 14th century and has been gradually developing ever since (along with the Duomo, that took about six centuries to complete), its overall plan, in its current form, is largely due to architect Giuseppe Mengoni, and dates back to the second half of the 19th century.