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The Scord of Brouster is one of the earliest Neolithic farm sites in Shetland. It has been dated to 2220 BC with a time window of 80 years on either side. It comprises three houses, several fields surrounded by walls, and a cairn. A sign by the Scord of Brouster states that the climate of Shetland became wetter towards 1500 BC, and that peat forming near the fields eventually forced the farmers to permanently abandon the site. The Scord of Brouster has three oval-shaped houses.
In all, nearly ten thousand pieces of quartz were found at the Scord of Brouster. 5688 stone artifacts were found in house one, 3772 stone artifacts were found in house two, and only 227 stone artifacts were found in house three. Of the 227 items found in house three, 225 are merely quartz flakes and chips. These pieces were found in what appears to be three phases: prior to the construction of the buildings, during active use, and during abandonment.
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.