It is the site of a megalithic structure, the oldest part are dated to around c. 4,000-3,650 BC and discovered in 1954, in a field owned by Segni family. The structure has a base of 27 m by 27 m and probably reached a height of 5.5 m. It culminated in a platform of about 12.5 m by 7.2 m, accessible via a ramp. It has been variously described as an altar, a temple or a step pyramid. It has been partially reconstructed during the 1980s. It is open to the public and accessible by the old route of SS131 highway, near the hamlet of Ottava.