Muraglia di Monte Ossoni, Archeological site in Castelsardo, Italy.
The muraglia di Monte Ossoni is a defensive wall made of stone blocks located along a trapezoidal-shaped hill in Castelsardo. The structure consists of large irregular stones carefully stacked without mortar, forming a solid barrier across the terrain.
This wall dates to the Copper Age, roughly 2900 to 2200 BC, built by prehistoric populations who settled on the hill. Archaeological excavations in the 1970s uncovered ceramic fragments that revealed multiple periods of occupation at the site.
Archaeological excavations in 1979 by Alberto Moravetti revealed ceramic materials indicating extended occupation during the Monte Claro and Bell Beaker cultures.
The site sits on a moderately steep hill and is reachable on foot with good views of the surrounding landscape. The terrain is open with little shade, so comfortable footwear and sun protection are advisable.
The wall stones display a particular technique: large irregular blocks of trachyte are arranged in rows so they fit together stably despite their irregular shapes. This polygonal masonry is a rare example of prehistoric craftmanship that managed to work with massive stone without modern tools.
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