text: 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 .
  
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  the Piazza San Marco and Piazzetta contain the Venetian basilica , the 500-year old Clock Tower and the Doges ' Palace .