St. Mark's Square is the center of life in Venice, where people can stroll, listen to music, drink coffee, shop, and feed pigeons. Nearby is the El Campanario bell tower, originally built in the 9th century and reconstructed in 1902. The Basilica of San Marco is a masterpiece of Byzantine architecture built in 830 AD as a chapel for government leaders, containing magnificent mosaics. Next to the basilica is the Ducal Palace, the former residence and seat of government for the Doges, connected to an old prison by the Bridge of Sighs. The Rialto Bridge spans the Grand Canal and has shops along its sides. Other landmarks include the