Since there’s not a church in Venice dedicated to San Valentino, I'm going with a “heart” theme instead.
This heart is on the floor of Basilica di San Marco and marks the place where the heart of Doge Francesco Erizzo is buried. His body is in the church of San Martino but his heart is here, as he requested in his will. There’s no name, just the little doge hat on top. He was doge from 1631-1646, a traumatic time in Venetian history that included 16 months of plague that killed 46,000 people, reducing the population by a third. Not many doges are buried in San Marco so I guess he must have been much loved to have his wish honored.
I read about this heart in a book, but it was many visits to San Marco before I finally stumbled across it and for some reason, it really moved me when I saw it for the first time, maybe because that church has my heart too. Anyway, if you want to see it, it’s in the high altar area to the left of the saint’s crypt.
Another heart, this one on the floor of the church of San Felice. I assume someone’s heart is buried here too but I don’t know who.
And then there's the "heart in brick" (cuore in mattone) which I wrote about here.
Happy Valentine’s Day to everyone!