This shrine to the Madonna is at the base of the Rialto Bridge, on the San Polo side. She's a bit worse for wear but there are always lots of flowers in front of her.
Venice Explorer has photos of this Madonna (scroll down to bottom right corner) as part of the evidence for their campaign to save Venice from the effects of sulphur created by gas-powered boats. It's pretty incredible to see how much this Madonna has deteriorated since 1976.
"In these pages we document the state of the stonework - bricks, Istria stone, Verona marble, and generally all of the calcars - of Venice. As will be seen, the assault of sulphur is consuming stones at a rate that allows us no more time for hesitation and speculation as to the effect on the fabric of the city. It is happening before our eyes. Most of the damage is very recent."
I'd be perfectly happy to see Venice without boats with engines. In fact, I have seen it - twice now I've been in Venice on days when the vaporetto drivers were on strike. There were still boats with engines tooling around but only small boats and not that many.
Venice is quiet anyway, compared to cities with cars, but it was quite magical and peaceful on those two days when the main things you heard were the sound of the oars splashing and the gondoliers singing.