HBO Game of Thrones has put this spectacular landscape spot in the map. We still can see Jon Snow and Daenerys Targaryen walking along a spectacular footbridge part of Dragonstone fortress.
The best known tradition around San Juan de Gaztelugatxe is to ring the hermitage’s bell 3 times and then make a wish. Not sure if it works or not, but what is certain is that in your visit you will hear the bell many times. Don't forget to bring comfortable footwear with you book your visit to avoid long queues and large crowds (it's free but booking is required on certain dates of the year).