The first known owner of Stora Väsby manor was Knut Karlsson (1485-1506). The Kurck noble family sold in to industrialist Emanuel de Geer in 1668. The present manor of Stora Väsby was completed around 1760 based on the design of Carl Hårleman. It is one of the best preserved Rococo-style buildings in Uppland.
Next to the castle is a Baroque-style park, which was built in the 1600s. The park was symmetric with hedgerows, trees and three ponds. Today Stora Väsby houses offices and residential apartments.
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.