They tell this legend in Erto:
Once upon a time there was castle in San Martino, but now only a hill remains with the name, and you can still take drinking water from the górc dal Castél or Castle Fountain.
A long stairway that led all the way up starts from the chapel washed away on October 9, 1963, the night of the Catastrophe, that was originally built on the ruins of an old pagan temple. In front of the castle beyond the lake the l’àndhre de la Regina - the Queen's Cave - remains with the s’ciara, the mooring ring for her boat.