Old Scatness is an archeological site consisting of medieval, Viking, Pictish, and Bronze Age remains. It has been a settlement for thousands of years, each new generation adding buildings, and leveling off old ones. A broch was discovered in 1975 and has been dated to 400-200 BC. The site is managed by the Shetland Amenity Trust. In the summer, costumed guides provide tours of the site and the replica Iron Age and Pictish buildings. The visitor centre also includes exhibits, and there are demonstrations of ancient crafts.References:
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.