It forms part of the Carnota Open-air Archaeological Museum. Located on top of a hill in the parish of Lira, from the summit we can enjoy an impressive, 360-degree panoramic view encompassing everything from Monte Louro to Cape Fisterra. It’s a fortification whose origins lie between Late Antiquity and the High Middle Ages. It has a double wall system, two internal enclosures and an entrance facing the harbour of Lira. In the beginning its purpose was to defend, but over time it was used for agricultural and livestock purposes. During the 20th century it was once again used as a refuge for the persecuted during the Spanish Civil War.