Stanely Castle is located in the waters of Stanely Reservoir. It was probably built in the early 15th century, on an island within a marsh. The castle is now a ruin. Since 1837 it has been partially submerged by the reservoir, and is completely inaccessible. When the water is drained it can be seen that the castle stands on a narrow promontory, which is connected to the reservoir bank on the southwest.
Stanely was the ancient seat of the Danzielstons. In the early 15th century the estate passed to the Maxwells of Calderwood, who sold it on in 1629 to Lady Ross of Hawhead. In the 18th century, it passed to the Boyle Earls of Glasgow. The castle was then used as a school, but was abandoned by the early 19th century. It was sold by the 4th Earl of Glasgow to the Paisley Water Company, who built the present reservoir.
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.