Banyeres Castle is an Almohad fortress built in the 13th century. The castle, irregularly shaped, has two enclosures and adapts to the ground. His most significant element is his tower of 17 meters. It has a square ground plan and three heights and is made of rammed earth.
The remains of walls, also made with mud, they have pockets made in later period and dominated the arches with voussoirs. Within the grounds there is a cistern and a chapel. It is currently the headquarters of Banyeres festive museum (Museu Fester).
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.