The Roman Mosaics 
A vast complex on three levels once linked the upper town to the harbor. Today, only about a third of the original edifice remains, including more than 9,150 sq ft (850 m2) of colorful mosaics. Built toward the end of the 4th century AD and developed over the centuries, it was the city's commercial center until the 7th century. Archaeological vestiges point to the existence of workshops, warehouses and shops in the area. Remains of the Roman public baths can still be seen nearby. Aqueducts brought water 6 miles (10 km) to the town.
