The Palazzo Reale complex houses the Norman Palace, Cappella Palatina "Palatine Chapel" and Gardens complex. Combination tickets are available and the lines tend to be long, so pre-book to save time. The Cappella Palatina is the highlight of this complex. However, in the lower level there is an interesting St. Rosalie "Patron Saint of Palermo" exhibit. If time is short in Palermo, this complex could be missed and other venues like La Martarana, Santa Catherina, and Palazzo Abatellis should be not be missed in my opinion.