Venice 's dazzling basilica , the Doges ' Palace ( Palazzo Ducale ) , and the 500-year-old Clock Tower ( Torre dell 'Orologio ) , all within the sprawling Piazza San Marco and adjacent Piazzetta , are the very focus of the city 's life .
the Piazza San Marco and Piazzetta contain the Venetian basilica , the 500-year old Clock Tower and the Doges ' Palace .