Capilla Castle was built by Moors to the site of ancient Roman fortifications. It was conquered by Christian king Ferdinand III of Castile and León in 1226 and rebuilt soon after. It stands on a crag where it reveals its structure in the shape of an irregular polygon attempting to adapt to the abrupt terrain. A barbican defends the main door, which leads onto the two courtyards. Inside, the cylindrical towers, the half-demolished allure and the remains of a machicolation give you an idea of the defensive nature this castle had.
In spite of its current appearance, you can still see the ruins of the old Arabic walls, both on the south side and the north, and the original stone paving of the staircases and rooms.
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Towering 52 meters above the sea, Bengtskär lighthouse is the tallest one in Scandinavia. The building started in in 1905 after the shipwreck of S/S Helsingfors and was completed in 1906. The lighthouse was designed by architect Florentin Granholm. On December a special petrol lantern, designed and built in Paris, was brought to Bengtskär and installed atop the tower.
German fleet bombarded Bengstkär in the First World War in 1914. Since the Gulf of Finland was heavily mined, it was not until 1919 that the surrounding seas were declared safe for shipping, that the light was lit again.
After the war the military value of Bengtskär increased as part of the defence system of independent Finland. In Second World War (1941) Soviet Union made a suprise attack to island. After a bloody battle, the small Finnish garrison emerged victorious. Intermittent repairs to the facility continued during the post-war period.