Wernstein Castle was built between 1362 and 1376 to replace a previous destroyed structure. It was first mentioned in a document when Heinrich von Künsberg endowed the chapel in Veitlahm with the provision that the local clergy should read weekly masses 'at Wernstein.' The castle has been continuously owned by the von Künsberg family since then. It was a fief of the Burggraves of Nuremberg, and the first recorded feudal letter dates back to January 20, 1395, when Ulrich von Künsberg was granted 'Wernstein the fortress and the enclosure' by Burggraf Johann III. In the 16th century, Hans Friedrich von Künsberg transformed the castle into a magnificent Renaissance palace. The castle suffered damage during the Thirty Years' War but was later repaired. Wernstein Castle is considered one of the most beautiful hilltop castles in the Franconian region. It is still inhabited by the descendants of its builders and is not open to the public for visits.
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.