In 1748, the construction of the Viapori sea fortress (Sveaborg in Swedish, “The Castle of Sweden), which is currently known as Suomenlinna, began on the islands just off the coast of Helsinki.
År 1748 inleddes bygget av Sveaborgs sjöfästning på öarna utanför Helsingfors. (På finska Suomenlinna, "Finlands slott").