Helsinki, the capital of Finland, is a well-known tourist city in Northern Europe, covered by snow and ice for about half a year. The old town of Helsinki is not large and is suitable for walking tours. There is also a well-known attraction in Helsinki, where almost everyone goes, the Suomenlinna in the sea. Suomenlinna was originally a military fortress, designed by the Swedes, and the name was also called "Swedish Fortress". The military fort began in 1748 and was designed and built by the young Swedish officer Austen Alan Wright, but it was not built until the end of the 18th century. From the city of Helsinki, you can take a boat to Suomenlinna. The military fort more than 200 years ago has now become a tourist attraction. The island is free to open and visitors can travel to the island simply by purchasing a ticket. The island has many military facilities, walls, fortresses, cannons, etc., as well as a beautiful church. In 1991, Suomenlinna was listed as a World Heritage Site. There are now ten museums on the island, including the Coastal Fortress Museum, the Wesco Submarine Museum and the Doll Toy Museum. Some museums are charged separately. Shinjuku Fortress is mainly located on the three islands of Dahei, Xiaohei Island and Langya Island. These three islands are connected to each other and can be visited on foot. There are also some residents on the island. Under the snow in winter, some of the islands local cabins are very beautiful.