Château de Laréole was built in 1579 by Pierre de Cheverry, a son of a great pastel merchant. The construction of the castle lasted three years and the Cheverry family kept the castle until 1707. After the Great Revolution, the castle changes hands several times before it was abandoned in1922. In 1984 the General Council of Haute-Garonne bought the property and restored it. Today the site is open to the public and guided tours are available.
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.