Among the most majestic towers built in Sardinia during the Spanish era, the tower of Longonsardo played a significant role in the defence against pirate raids and trade control. The shape of this 11-metre-high granite building is that of a truncated cone at the base, while the upper section is cylindrical. The access is located at 6 metres from the ground and leads to a bomb shelter, the so-called pillbox. The tower of Longonsardo stands on a promontory overlooking the Strait of Bonifacio and offers an awesome panoramic view that extends until Corsica.