The ancient village of Roccavaldina was conquered by Romans, Byzantine and Arabs. Later in the Middle Ages, it was ruled by Roger I, who built numerous monasteries with the aim to spread the Christian culture over the area. The Valdina Castle was built as a stronghold in the 16th century and later transformed in a prive aristocratic house; the Chemistry Museum is an ancient shop created in 1628 which contains over 200 apothecary jars made with the local ceramics.
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.