Surrounded by precious olive-groves, Salon-de-Provence was fortified in the 12th century, and today retains much of its central medieval layout. With plenty of cafes, boutiques and delicatessens to poke around in, you could start your exploration from pretty place Crousillat, on the cusp of the old town, then explore twisting streets once wandered by prognosticator Nostradamus.
Also worth a visit is the 14th-century Collégiale St-Laurent and the town's two famous, long-lived savonneries (soap-makers). From the turn of the 20th century until the 1950s, soap was a buoyant business thanks to Salon’s abundance of olive oil and the palm and copra oils arriving from the French colonies. Perhaps the key sight, however, is the imposing Château de l'Empéri, an overwhelming fortified palace that's now an accessible museum of art and military history.