The Palazzo Reale di Napoli is a palace, museum, and historical tourist destination located in central Naples. It was one of the 4 residences near Naples used by the Bourbon Kings during their rule of the Kingdom of the Two Sicilies (1734-1860). With the arrival of Charles III of Spain in 1734, the palace became the royal residence of the Bourbons. Upon his marriage to Maria Amalia of German Saxony, Francesco De Mura and Domenico Antonio Vaccaro helped remodel the interior. It was Charles who build the other 3 palaces on the periphery of the city center. Today, the palace and grounds house the Teatro San Carlo, the smaller Teatrino di Corte, the Biblioteca Nazionale Vittorio Emanuele III, a museum, and the regional tourist board.