Finland , Olofsborg Fortress
Olofsborg (another name is Olavinlinna) is a 15th—century fortress on a tiny island in the Finnish city of Savonlinna. This is the northernmost medieval fortress that has survived to this day. The island is connected to the mainland by a pontoon bridge.
Initially it belonged to Sweden, then it became part of the Grand Duchy of Finland as part of the Russian Empire, and then became part of independent Finland.
The fortress was founded in 1475 by the Danish knight, royal governor Eric Axelsson Tott. Then it was called Nyslott (then Saknt-Olofsborg) and served to protect the eastern borders of the Danish-Swedish kingdom.
Over time, a settlement was formed around the impregnable fortress, which in 1639 acquired the official status of a city and became known as Savonlinna.
Several historical expositions have been opened in the walls of the fortress, as well as a small collection of Orthodox icons.
https://earth.google.com/web/search/Olofsborg
