Linked to the historic Canal du Rhône à Sète, Aigues-Mortes in the Petite Camargue wetlands is a finely preserved medieval town. The outstanding crenellated 13th-century Constance Tower replaced an earlier one built by none other than Charlemagne. Visitors walking its ramparts are treated to views over the purple-blue lagoon waters where fishing and saltworks once dominated. The area is still known for its uniquely small Camargue bulls and horses.