One of the most characteristic features of Sardinian architecture, playing an important part in the scenery of the island, is provided by the ancient, forbidding and imposing megalithic structures which the local inhabitants, in the original prehistoric and pre-Indo-European tongue, call nurakes, nuraghes, nuraxzk, nuraccis, nuragis, nuracus, etc., according to district and dialect. We generally know them by the Italian form of the word, nuraghi (singular nuraghe).

Built of large blocks set without mortar in more or less regular horizontal rows, the nuraghe, in its simplest form, appears as a round tower with battered sides. Its height depends upon the number, from one to three, of the storeys it contains, and may sometimes, as at the nuraghe Santu Antine at Torralba in the province of Sassari, reach as much as 20 m., with walls from 2 to 5 m. thick (PLATE VIId).