The Losa ("tomb" in Sardinian) was built between the 15C and the early 9C BC and is an impressive example of Nurgaic art, with its typical layout, harmoniousness and masonry technique. The oldest part is the central two-storey tower, the upper rooms of which are joined by a stairway. The vestiges of an exterior wall run around this fortress and the circular huts. Finds from archaeological digs on the site are exhibited in the small antiquarium.