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Iserlohn is a city in the district of Märkischer Kreis, North Rhine-Westphalia, Germany. Iserlohn is a town with a mix of history and nature. Surrounded by hills and forests, it offers a serene living environment. The Seilersee is a picturesque lake for outdoor activities and relaxation. The Dechenhöhle is a show cave with stunning underground formations. Iserlohn’s Altstadt (Old Town) boasts charming streets and historic buildings.