Embellishing the Valle di Truculu are two almost-identical nuraghe megalithic edifices that date back around 3,500 years – the Orruttu and Sanu that rise up majestically, two kilometres from each other. Perhaps, together with a settlement and two megalithic tombs, they constituted a fortified palace on the Osini plateau, in the centre of Ogliastra, also renowned for the imposing and beautiful complex of the Serbissi nuraghe. Departing from the village, one reaches the valley passing the Scala di San Giorgio, a narrow passage dominated by the Castello, a rocky peak that was perhaps once a fortified Roman-Byzantine residence. After the ridge, about four kilometres from the village, is a lush green area replete with remnants from the Nuragic civilisation.