Statues of the mythical twins Castor and Pollux guard the entrance to the Palazzo Reale and, according to local legend, also watch over the border between the sacred (‘white magic’) and diabolical (‘black magic’) halves of the city. Built for Carlo Emanuele II around 1646, its lavishly decor­ated rooms house an assortment of furnishings, porcelain and other knick-knacks.