There are shrines all over Venice but the sestiere with the most is definitely Castello which also has a number of very large shrines, almost chapels. This one is so obviously loved and taken care of so well. It's unique too because of what's inside.
It really tugged at my heart strings when I looked inside of this one. Hundreds maybe thousands of photos, some of them very old. Seems to be a memorial shrine for folks in the neighborhood. And there's a small teal-colored Madonna on the wall next to the shrine, with an eternal light/flame. Very sweet.