<a href="https://en.wikipedia.org/wiki/Olavinlinna" class="extiw" title="en:Olavinlinna">Olavinlinna</a> (literally St. Olof's Castle in English) is a 15th century castle located in Savonlinna, Finland. The castle is the heart of the Savonlinna Opera Festival. Since the castle works as an opera house, it gives a spectacular environment for music and theatre. The castle was founded in 1475 when Finland was the Swedish frontier against the Russia. The castle is located on an island in a strong current between two lakes.
<a href="//commons.wikimedia.org/wiki/User:P%C3%B6ll%C3%B6" title="User:Pöllö">Pöllö</a>
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Picture taken by Pöllö