Aracena Castle was erected in the 13th century, during the Islamic period, and was itself built on the site of an ancient Moorish castle. The walled enclosure was partitioned inside, with the tower of homage, or castle keep, defending the barrier that divided its interior. The population of Aracena settled around this structure, giving rise to the current urban landscape. During the late Middle and Modern Ages, Aracena continued growing from the Cerro del Castillo (castle hill) into the valley, first as unattached land dependent on Seville and later, in the seventeenth century, as a feudal estate under the jurisdiction of the Count-Duke of Olivares. Still later, it was under the Count of Altamira, who carried the title of Prince of Aracena.
The fortress consists of the alcazaba, or citadel, with its watch tower, cistern and walls; these are flanked by other towers, as well as a fence line that, in its interior, once accommodated medieval living quarters.
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.