Located next to the Church of Santa Maria, is one of the few castles that have been preserved in Cantabria. This fort was the main place of the village defense . Pentagonal shaped structure with strong angular bins . It is a masonry and construction is believed similar to that of the Church.
The Lighthouse of Castro Urdiales ( nineteenth century ) lies adjacent to the castle and was lit for the first time on November 19, 1853 . The focal plane is located at 49 meters above sea level and 16.49 meters on the ground. Initially had a lighting system based on an oil lamara with fixed lens , which revolved around two lenses that were driven vergicales a clockwork machine . Besides lighting system , since 1953 there is a fog horn made of a single vibrator that emits the signal in Morse code letter \" C \" , which is repeated every 60 seconds.
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