Olavinlinna, St. Olaf's Castle, Finland, is the northernmost medieval stone castle in Europe. Finished in 1499 by a Danish-Swedish noble to secure the border areas against Russia. Modernized in the 18th century. Never captured in battle. pic.twitter.com/5NLdIlmLsx
— Wrath Of Gnon (@wrathofgnon) January 22, 2026
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