Uncovered in the 1930s when locals were searching for fresh water springs, it comes to no surprise that the sacred well known as sa Testa had been chosen by the Nuragic Age settlers to honour their water divinities. Today it is a site very popular with archaeology enthusiasts, especially those studying Nuragic culture. The old shrine dates to between XV and XIII centuries BCE and sits just outside of the town of Olbia. It is just under 18 metres long and made of granite, trachyte and schist cut into blocks that were then carefully finished. The external part is reminiscent of a door and symbolizes the gateway that separates the world of the dead from that of the living. The shrine has a circular courtyard, a vestibule, a small hallway between the courtyard and the well, and steps that lead down to the water at the bottom.