Lake Garda, in northern Italy, is known for its crystal clear water. At the south end, the town of Sirmione is dominated by the Rocca Scaligera, a fortress with harbor views. The nearby Grotte di Catullo archaeological site includes a Roman villa. On the lake’s western shore, in Gardone Riviera, is Il Vittoriale degli Italiani, former home of poet d’Annunzio. The Dolomites frame Riva del Garda, a resort in the north.