The first synagogue dates from 1528 and was built by German Ashkenazi Jews. Others followed and served different groups, including one for Spanish Sephardic Jews and one for Italian Jews.
None is visible from the street, as strict rules imposed by Venice's rulers didn't allow Jews to practice their faith openly. All the synagogues are hidden away on the top floors of seemingly normal buildings that on the lower levels held cramped living spaces for Jewish families.
The synagogues have remained operational continuously, except for the years of World War II during the German occupation.