The mediaeval greystone church is dedicated to St. Olav and was built in the 1450's. Long ago, Lemu was part of the great Nousiainen ancient parish, but parted to an independent administrative and ecclesiastical parish in the Middle Ages. When an episcopal church was erected in the old mother parish, a sanctuary consecrated to St. Olav was built also in Lemu.
First, a small wooden chapel was raised on Toijainen hill probably in the 13th century. An old crucifix and a baptismal font in the present church date back to those times. In the 14th century a small stone chapel was built and it now serves as the sacristy. In the 1430's an imposing mediaeval stone church was erected, partly by the wealth of the noblemen, partly by the toil of the peasants.
There are several curiosities in the church, such as - the only one of its kind in Finnish churches - the coat of arms of Mauno Särkilahti (Stjernkors), a painting of Martin Luther, an old Bible and a note of Marshal Mannerheim’s participation in confirmation. The years 1380, 1450 and 1959 are marked in the church banner. The altarpiece ”The Resurrection” by von Becker dates back to the year 1880.
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.