Schauwenburg Castle has a history dating back to the Middle Ages when, according to historical references from the early 13th century, the Lords of Bertrange occupied a fortified castle. Today's building originated in the 16th century as testified by the Renaissance windows on the eastern and northern wings, the façade being completed in 1710. Around 1780, the d'Huart family who lived in the castle found the facilities too small and constructed a larger building, the Château de Colnet d'Huart, in the vicinity.
Over the years, the Schauwenburg Castle has had many different owners and has been used for a variety of purposes. Since 2008, it has temporarily housed the Commune's administrative offices and served as the town hall.
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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.