Bärbo Church was built around 1200. Although it has been enlarged in the 15th and 18th centuries, it is still one of the smallest in the Södermanland region. The belfry dates from 17th century and was restored around 1740. The font is original from the early 1200s. Also the chandelier and triptych dates from the late Middle Ages. The pulpit was carved ion 1640. The unique detail is also a gallery for nobles, added in 1755. It was built by Fredrik Bengt Rosenhane, the owner of near Täckehammar estate.
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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.