When exploring the old city, it’s important to stop by Mellah, otherwise known as the Jewish quarters. You’ll know you’ve found the place once you’ve come across streets with blue and white buildings. Half of the section is in ruins and only approximately 70 Jews are left in this neighborhood (it used to have a population of 250,000). Take your time to explore the area and get a true sense of its history. And of course, there are many great photo opportunities at every turn. While there, you can also explore the Jewish cemetery at no cost.