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Founded: 1636Category: Industrial sites in Sweden
Historical period: Swedish Empire (Sweden)
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The blast furnace of Trehörning was built originally in 1636. In 1648 Louis De Geer acquired the site and affiliated it to Godegård Ironworks. The factory belonged to Godegård until 1888, when it was sold and ran down in 1889. The main restorations were made in 1932 and 1969. The original buildings are well-preserved.
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.