Santa María Magdalena (St Mary Magdalene) was erected in the second half of the 12th century, perhaps on the site of a Mozarabic church. The sculpted portal is elaborately decorated with biblical scenes and those of daily life. The bell-tower is also Romanesque with a series of rounded arches. The interior has a 16th-century gilded retablo dedicated to Mary Magdalen. The chapels were built during the 16th and 17th centuries.
References: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.