Bočac Fortress is located on the left bank of the Vrbas River, on the half of motorway E661, between Banja Luka and Jajce. It was built in the early 15th century on a rock, in order to defend the crossing over the Vrbas River. The Fortress was mentioned for the first time in a charter from 1448. From 1463 to 1527, when it fell under the Ottoman rule, the city used to be the fortification of the Banovina of Jajce. In the early eighteenth century, Bočac was mentioned as a settlement with a few cannons. It was abandoned before 1833. During the Ottoman occupation it was subsequently fortified and maintained and the fortified walls and towers that surround the large garden of the town are relatively well preserved today.
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.