Castle Roy is one of the oldest castles of its type in Scotland unique in that it is largely unaltered, whilst most other castles have been extensively modified over the centuries. The castle is thought to have been built at some point in the early 13th century, replacing an earlier wooden motte and bailey keep of Norman influenced design. In accordance with its early design it is one of Scotland’s simplest forts consisting of four curtain walls, about 7 ft. thick, forming a square. Presumably the walls defended a number of timber buildings which have since disappeared. One theory is that Castle Roy was built by James, son of the Earl of Mar, in 1226, after having receiving the title of Lord of Abernethy from King Alexander II. It may have become a residence of the powerful Comyn family, rivals of the famed King Robert the Bruce.
In 1548 the Castle was named in the Charter of the Earldom of Moray and therefore possibly it was still in use, although in the era of gunpowder will only have been of use as a fortified shelter.
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.