This is one of the most beautiful campanili in Venice. The leaning tower in Pisa is more famous but Venice has more than one that's a bit wonky. In all honesty, nothing in Venice looks particularly straight but there are at least four other church towers with fairly dramatic tilts: Santo Stefano, San Martino (on Burano), San Pietro Martire (on Murano), and San Giorgio dei Greci (this one had some work a few years ago and is a bit more upright than it used to be, I think).
The San Pietro campanile was the first Renaissance bell tower in Venice, built in 1463-64, and was the third one built for this ancient church.
The first tower, built in 774, collapsed after an 1120 fire. The second was destroyed in a storm in 1442. And even this one has undergone repairs several times after being hit by lightning and damaged in storms. This tower is completely clad in slabs of Istrian stone, and it’s the weight of those slabs that causes it to lean. It’s a beauty.