Chinese tourists with umbrellas at the Doge's Palace in Piazza San Marco, Venice, Italy. The wide expanse of Piazza San Marco is in the heart of Venice and where, for most daylight hours, the pavement is crowded with humanity as the influx of tourists who, in their own way, flood the narrow streets with sun-shading umbrellas and the smaller canals with gondolas. Venice attracts 22-million visitors each year (for a city of only about 60,000 residents) while the cultural protection organisation, Italian Nostra, warns that Venice can only accommodate about 33,000 visitors per day but currently at least 60,000 daily.