Olavinlinna (; literally St. Olaf's Castle, see Olaf II of Norway) is a 15th century three-tower castle located in Savonlinna, Finland. It is the northernmost medieval stone fortress still standing.https://www.gearthhacks.com/dlfile23910/St.-Olafs-Castle,-Savonlinna.htmhttps://www.finland (...) (from Wikipedia)