Designated as a historical monument in 2008.
To shield the fishing port developed in 1624, a protective fort was built in 1627 on the rocky islet at the Socoa Point. This fort was rejected by the inhabitants but was, however, rebuilt in the 1680s due to the threats of landings by the English. François Ferry was the engineer who organised the site around an imposing medieval-style crenelated tower. At the beginning of the 20th century, after many modifications, the fort started to be used by the local customs office. Then, during the World War Two, it is occupied by the German army. Restored by the architect André Pavlovsky after the war, the fort is then home to a sailing school from 1946 to 2002. Nowadays owned by the agglomeration community of the Basque Country (communauté d'agglomération du Pays Basque), this monument, which is inextricably linked to the bay, still has to reveal all its secrets.
Visit possible.