The crème frites, that is supposedly a Venetian traditional dessert, was possibly first invented by nuns who sold them to support their convents.
This is a typical street food that is very popular in Italy as well as Spain (where they claim to have invented it).
Until the 9th century, most of the buildings in Venice were only two stories high, however over the years, as more and more people came to settle in the city, they had to add more floors to their houses.
Antonio Vivaldi was born in 1678 in Venice and started teaching the violin at the Ospedale della Pieta in 1703. His Baroque works allowed him to gain recognition and respect in the city and around the world.
The church of Ospedale della Pieta holds frequent mass services and even some music programs of Baroque style to this day, so it would be interesting to attend some of their events while on your trip in Venice.