The castle was built by the Hohenstaufens and dates back to 1147. Koenigsburg means royal castle in German, haut means high in French, symbolizing the German-French background of the Alsace. On the signature of the Treaty of Versailles in 1919, the Haut-Koenigsbourg was definitely handed over to France. The structure of the castle gives an accurate idea of how a mountain fortress looked like in the Middle Ages. Its interior walls are decorated in a rich medieval style, and it houses an exceptional collection of weapons and furniture, mainly from the 16th and 17th centuries.