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ArtistThe typical nuraghe is situated in areas where previous prehistoric Sardinian cultures had been distributed, that is not far from alluvial plains (though few nuraghes appear in plains currently as they were destroyed by human activities such as agriculture, dams, road building etc.) and has the outer shape of a truncated conical tower, thus resembling a medieval tower, with a tholos-like vault inside. The structure's walls consist of three components: an outer layer (tilted inwards and made of many layers of stones whose size diminishes with increasing height: mostly, lower layers consist of rubble masonry, while upper layers tend to be of ashlar masonry); an inner layer, made of smaller stones (to form a corbelled dome of the bullet-shaped tholos type, and where ashlar masonry is used more frequently); and an intermediate layer of very small pieces and dirt, which makes the whole construction very sturdy: it stands only by virtue of the weight of its stones, which may each amount to several tons. Some nuraghes are about 20 meters in height, the tallest one known, Nuraghe Arrubiu, reached a height of 25–30 meters.