Venice’s small islands were enhanced during the Middle Ages by the dredging of soil to raise the marshy ground above the tides. The resulting canals encouraged the flourishing of a nautical culture which proved central to the economy of the city. Today those canals still provide the means for transport of goods and people within the city.The maze of canals threading through the city requires more than 400 bridges to permit the flow of foot traffic. In 2011, the city opened the Ponte della Costituzione, the fourth bridge across the Grand Canal, which connects the Piazzale Roma bus-terminal area with the Venezia Santa Lucia railway station. The other bridges are the original Ponte di Rialto, the Ponte dell’Accademia, and the Ponte degli Scalzi
