Transfiguration Church of the St. Euphrosine monastery is a well-preserved monument of Pre-Mongol Rus architecture. It was built between 1152 and 1161 by the Polatsk architect Ioann by the order of the princess St. Euphrosyne of Polatsk as a cathedral church of the Convent of the Saviour and St. Euphrosyne. In 1582, King Stefan Batory gave the church to the Order of Jesuits. In 1832, the church was placed under the Orthodox administration, and in 1990 it became a property of the Belarusian Exarchate. In the 19th century it was partially remodeled according to the design by the architect A. Port.
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.