The manor, first mentioned in 1523, was for a longer period of time associated with the noble family of von Ungern-Sternberg. The Neo-Baroque castle, constructed on the manor grounds in 1890 (a copy of the Merseburg castle in Germany), was never finished. After World War II the manor fell into the hands of Soviet troops, in 1968 the chief of the airport decided to use the ruins of the manor to fill in the holes in the runway. About one third of the manor was torn down, fortunately the rest was preserved until today.
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.