Clemency Castle is small residential manor adjacent to the church was built in the 1660s in the Renaissance style. It had fallen into disrepair but was fully renovated in 2009 and is occasionally open to the public.
The castle was built in 1665 by Johann Ferdinand von Blanchard, a sire of Clemency. For building materials, he used the ruins of an earlier castle which stood on a site some 30 metres away from today's castle. Fifty years later, it was transformed into the Baroque style of the times. In 1721, after von Lanser had bought the property, it once again underwent transformations. In 1982, Jean Weis acquired the property which was inhabited until 2004.
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.