The Church of St. Denis in Liège is a former fortified collegiate church, founded by Notker of Liège in 987 and first consecrated on 12 March 990. The tower was added around 1100. The church has since 1936 been registered as a listed building, and is currently listed as 'exceptional heritage' of Wallonia. The collegiate church was suppressed in 1797, but the building was taken into use as a parish church in 1803.
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.