Chenini is one of the best-known Berber towns in southern Tunisia, and with good reason: the second that white mosque comes into view, you're struck by how beautiful it is. (And you may also be struck by the number of visitors - as with all "best-known" places, it attracts travelers).
The indigenous Berbers built homes and communities on these rocky outcroppings - several of these can be visited, although not all of them remain inhabited. Many comprise the ruins of the ancient towns spread across the tops of cliffs as well as a functional modern village in the valley below.
In Chenini, park at the bottom of the ridge and climb up to the centuries-old mosque. It's windy at the top, but the view is worth it.