Hermitage of St. Catherine, located on the peninsula of the same name, dated from the 19th century. It is a privilleged site due to the spectacular beauty of the surroundings and its strategic position at the entrance to the estuary, commanding all manoeuvres made in entering and leaving the estuary of Mundaka. The building is a transition from gothic to renaissance. The walls surrounding the shrine are ancient remains of a fortess from the same period.
During its history, due to its distance from the town centre, it was often used as a meeting place for the fishermen's guild and place for quarantining the victims of epidem.