1. The Piazza di San Marco - VeniceThe Piazza di San Marco may be more famous, but the Ponte di Rialto (Rialto Bridge) is the true heart of Venice. The current structure was built in just three years, between 1588 and 1591, as a permanent replacement for the boat bridge and three wooden bridges that had spanned the Grand Canal at various times since the 12th Century. It remained the only way to
