An attack by the Saracens in 891, who remained until the end of the 10th century, devastated the country around current Cannes. The insecurity of the Lérins islands forced the local monks to settle on the mainland, at the Suquet (today the old town). Construction of a castle in 1035 fortified the city by then known as Cannes.
The castle was damaged in end of the 16th century and partially demolished in the 18th century. In 1919, the municipality of Cannes acquired all the buildings in order to house its museum. Today the Musée de la Castre hosts 19th-century Riviera landscape art, musical instruments & ethnographical items in a medieval tower.
The city walls of Avila were built in the 11th century to protect the citizens from the Moors. They have been well maintained throughout the centuries and are now a major tourist attraction as well as a UNESCO World Heritage Site. Visitors can walk around about half of the length of the walls.
The layout of the city is an even quadrilateral with a perimeter of 2,516 m. Its walls, which consist in part of stones already used in earlier constructions, have an average thickness of 3 m. Access to the city is afforded by nine gates of different periods; twin 20 m high towers, linked by a semi-circular arch, flank the oldest ones, Puerta de San Vicente and Puerta del Alcázar.