“Will you look at that? St. Mark’s Square is flooded!” An Australian day tripper is astonished. “This place is actually sinking,” her friend casually exclaims. They, like so many I’ve overheard on the vaporetti, are convinced that the Venetian islands exist on a precipice between the fragility of their current condition and nothing short of imminent submersion. With catastrophe always around the corner a short break in Venice is more of an extreme adventure trip than a European city-break. If it were true, that is.