Jerez de los Caballeros Castle dates back to the 13th century. The castle stands on the western part of a hill, around which the town of the same name extends. Since the Neolithic it was inhabited by Phoenicians, Celtic Betures, who were initially known as 'Ugultiniacum', Romans, Visigoths, Muslims and chivalric orders such as the Temple and Santiago settled chronologically in these territories.
The current castle was built by the Templars, who refused to lay down arms when the order was suppressed, and came to a sticky end. You can wander around at will, but it's basically just the impressive walls that are preserved, with pretty gardens dotted around.
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.