The Roman theatre in Vienne was built around 40-50 AD and is considered to be one of the largest theatres in Roman Antiquity with a capacity of 11500 seats and a diameter of 130 metres. In the 2nd century it was double sized by a second smaller theater, the odeon, which was built nearby on the southern slope of the ravine of Saint-Marcel.
The annual Vienne Jazz Festival has been held on the ancient theatre since 1980.
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.