The parish church dedicated to St. Dorothy was probably erected by the end of the 15th century. In the end of the 16th century a bell tower was added to the nave. It was renovated and partially transformed at the beginning of the 19th and 20th centuries. The interior is decorated with a renaissance polychrome from the mid 16th century and with a mannerist one form the mid-17th century. The chapel is among the oldest of the corner joining wooden churches.
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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.