In 1716 Pope Clemente XI entrusted the building of the Watchtower in Portonovo; it is a square building reminding of the 15th-century features and built with the Conero stones and bricks, with a cover used for the stationing of fire-arms. The garrison was useful to sight and stop the raids of pirates and smugglers. It became the shelter of the poet Adolfo De Bosis; it was also frequented by Gabriele D'Annuzio, and belongs now to his heirs. It houses nowadays cultural initiatives and, on demand, it is open to visits.