Finland Fort is built on a series of islands off Helsinki, including Great Black Island, Little Black Island and Wolf Island. Finland Fort is an ancient coastal fortress, which restricts the sea route from the Gulf of Finland to Helsinki. Its geographical location is very important. Founded more than 250 years ago, Fort Finland is a masterpiece of Swedish designer and artillery officer Oxstein. It is one of the largest coastal defense military fortresses in the world. It is also one of the most important and famous scenic spots in Finland. There are churches, barracks, gates and other historic sites. There are rare maritime military relics in the world. There are 10 museums on the island, including the Coastal Battery Museum, the Wisco Submarine Museum and the Doll and Toy Museum. In 1991, Finnish castles were listed on the World Heritage List by UNESCO.