The only city i the world to have the most number of bridges, 446, is Pittsburgh. The city is build right at the confluence of Monongahela and Allegheny and where they meet they form the Ohio River which flows into Mississippi.
With that many bridges you can see why it beats Venice. It is amazing how many things can humans achieve if they truly wish so. So, if you have enough time on your hands visit all those 446 bridges 😀