Vaxholm Fortress Museum
Built in 1548 to defend Stockholm against shipborne attacks from the east, this historic fortification on the island of Vaxholmen, just east of Vaxholm, is now a museum. Visitors see the fortress as it was in 1854, and can enter the citadel’s bombproof vaults to imagine how things were during the Crimean War. You can also visit the World War II coastal defense artillery post.