The Alvu nuraghe at Pozzomaggiore, pictured here in the beautiful photos by Nicola Castangia and Giovanni Sotgiu, does not fail to surprise the visitor with some of its peculiarities. In spite of its name, which is already familiar from other towers such as the Alvu di Nulvi, the nuraghe is characterised by a bichromatic main tower. Starting from the bottom and up to eight rows, the stone used is dark basalt, more or less hewn. From the ninth row onwards, the stone is white limestone, more accurate in the cutting of the ashlars, which become smaller in size as one ascends in height.
It is interesting to note that during the excavations carried out in the years 2006-2007, a sherd with graphic signs was found, the image of which is included in the appendices.
