It stands on the top of a hill like a sentinel, almost as if ‘protecting’ the memory of the times when the area was considerably important, from the Bronze Age to the Imperial era. The nuraghe Santu Millanu is located in the region of Part’e Alenza, in the territory of Nuragus, with a view of Sa Jara Manna, the largest and most famous giara, in the background. In Roman times, the settlement of Valenza was located here and was an important site along the road between Karalis and Ulbia. It is a quatrefoiled nuraghe, with a central tower (the keep), which is still about six metres high and surrounded by a bastion, barely detectable on the ground, with four circular towers in the corners. The construction material is limestone, obtained in large square blocks, arranged in even rows.