The Château de la Motte-Glain was built by Pierre de Rohan-Gié in 1495 on the site of an older fortress belonging to the lords of Rougé. Anne of Brittany and Charles VIII stayed there in 1497 and Charles IX and Catherine de' Medici in 1565. It was bought in 1635 by par Michel Le Loup, counsellor to the Parlement of Brittany. The castle was modified by Pierre de Rohan-Gié in the 17th century.
The castle includes a gatehouse composed of a central pavilion flanked by two round towers, some ruined buildings (including a storeroom and a press), a residence decorated with Renaissance windows from the 15th century. The chapel contains a fresco from the 16th century.
The castle is privately owned. Parts of it (gatehouse, storeroom, press, chapel, residence, bay, roof, wall) have been listed since 1926 and protected since 1929 as a monument historique by the French Ministry of Culture. It is open to the public in the summer months.
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.