The current Stolzembourg castle was built on the ruins of the medieval castle in 1898 in the style of a Scottish country house.
In the 12th century, a tower was built to keep watch over the road along the River Our. The first mention of a fortress was in 1315. In 1454, the governor Antoine de Croÿ pulled down the castle. After it had been rebuilt, it was finally destroyed by the French troops of Louis XIV in 1679. In 1898, a Scottish-style country house was built on the ruins.
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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.