Château de Sauveterre was constructed at the end of the 13th century by Edward I of England on one of the principal routes between Périgord and Agenais. During the Hundred Years' War, it became a centrepiece in the Anglo-French war of attrition. It was burned in 1789 during the French Revolution.
It was bought by the aviator Jean Mermoz in 1936, less than a year before his death. He had seen the castle from the air. After his death, the castle was abandoned and became the property of the commune until it was sold in the 1980s.
The castle in its entirety, as well as its grounds and moat, have been classified as historical monuments since 19 September 2003. It is privately owned.
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.