Wildenburg is a ruined castle near Kempfeld in the county of Birkenfeld. The ruins lie in the Hunsrück mountains between the Idar Forest to the north and the town of Idar-Oberstein.
The predecessor of the Wildenburg was probably a Celtic refuge fort with double ramparts from the La Tène period (ca. 450-50 B.C.). The Wildenburg rampart is one of a number of Celtic fortifications in southern Hunsrück between the hillfort of Otzenhausen, the Ringkopf, the Altburg and the Alteburg in Soonwaldsteig. A short section of the rampart has been reconstructed as a 'Gallic Wall' (murus gallicus).
Around the year 350 AD a late Roman fort was established on the Wildenburg for a short time.
In the Late Middle Ages Wildenburg was built by the Wildgrafen family on the rocks at the western tip of the circular rampart. It was first mentioned in 1330 and was pillaged and destroyed by marauding troops from Lorraine in 1651. After being partially rebuilt in 1660, the lower ward of the castle acted as the administrative headquarters for the Amt of Wildenburg until the abolition of the county in the 1792.
Of the upper bailey (Oberburg) that was built on rocks only a few wall remains have survived. However, in 1980, a 22-metre-high observation tower was built on the top of the rocks that was opened in 1981.
In 1859 the buildings of lower bailey (Unterburg), including the gate tower, domestic buildings and enceinte, were restored for the Prussian Forestry Commission. These buildings were further converted into the present-day castle cafe and headquarters of the Hunsrück Club.
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.