The church of Saint-Pierre d'Andenelle with its tower dates from the 12th century. Built of reddish sandstone, this remarkable monument of Mosan architecture is one of the oldest in the region. It underwent alterations in the 17th century (the inside pillars were changed), in 1853 (the entrance portal, which used to be found in the north, was moved to the west), in 1860 (building of the transept), in 1875 (the portal was moved to the north as a result of the building of the Andenne-Haillot road) and in 1923 (building of the side aisles). It is a mistake to believe that it was built in a hollow. In times past, it was level with the road and the square. People entered on a level, through a big door at the foot of the tower, next to the stream. But when the Haillot bottom road was built, the portion of the road was raised and people had to go down a few steps to enter the church.
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.