Rheineck Castle was probably built in the 12th century. The sources name the count palatine Otto I of Salm as the founder. After his death, King Konrad III seized his estate and transferred it to his brother-in-law, Count Herman of Stahleck. This endeavour resulted in a bitter fight for the County Palatine of the Rhine - a conflict that culminated in the complete destruction of Rheineck Castle by the troops of the King in 1151. Rheineck Castle was rebuilt by the Archbishopric of Cologne by 1164 at the latest but did not, however, withstand the Palatine War of Succession in the 17th century. The Prussian politician von Bethmann-Hollweg inherited the ruin in 1832 and had the main building reconstructed together with the castle chapel. The latter represents a special feature, with its eight-sided design, which is reminiscent of the Carolingian Octagon of Aachen Cathedral. Today, the Castle is in private ownership and cannot be visited.
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.