Stock Photo - Fort Oskar-Fredriksborg in the Stockholm archipelago on the island of Rindo, Sweden. The fort was build from 1870 to 1877 and remained in use during the Second World War. Rindo Island is in the Baltic Sea.

Stock Photo: Fort Oskar-Fredriksborg in the Stockholm archipelago on the island of Rindo, Sweden. The fort was build from 1870 to 1877 and remained in use during the Second.