musei.beniculturali.it/en/museums?mid=463&nome=complesso-nuragico-di-santu-antine

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The round main tower, 17.55m high, is built of big basalt blocks rough- shaped at the base, more regular and smaller to the top. It develops on three floors with three circular tholos chambers, with intact roof in the first two floors. Around the ground-floor room there is a corridor lightened by nine loop- holes. The structure of the bastion, on two superimposed levels, is very complex.