Žabljak Crnojevića is an abandoned medieval fortified town in Montenegro located on the confluence of the Morača river in Lake Skadar. It is believed that this fortress was founded in the 10th century during the reign of the Vojislavljević dynasty in then-known Dioclea, whereas the first known written testimony of the fortress originate from mid-15th century.
The fortress served as the capital of Zeta under the Crnojević dynasty from 1466 till 1478, being the seat of Stefan and Ivan Crnojević. However, Ivan Crnojević was forced to move the capital in 1478 when the Turks seized the town during the siege of Shkodra, holding it until the decision of the Berlin Congress in 1878 when it fell under Montenegrin administration once again after 400 years of Turkish rule.
The town has tall walls with towers, as well as one gate. Within the walls can be found Ivan Crnojević's court, Church of Saint George (was turned into a mosque during Ottoman rule), housing and military facilities, a warehouse for clothes and a water tank, most of which are preserved.
In the early 17th century, the town was under Turkish rule. The fortress had only one resident, the Dizdar Aga (Turkish official).
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.