Schloss Arenfels was built as a fortress in 1258-59 in Bad Hönningen, Germany along the Rhine River. It was built by landgrave Gerlach von Isenburg. In the 17th century it was turned into a Renaissance Palace, and in 1849 was renovated in a Neo-Gothic style by Ernst Friedrich Zwirner. In that same year it was acquired by the Count of Westerholt-Gysenberg. Today it is the location of the Cafe-Terrasse, which offers wine tastings and dining in the castle's old Knights Hall.

http://www.general-anzeiger-bonn.de/freizeit/sehenswertes/schloss_arenfels.html
http://www.bad-hoenningen-rhein.de/stadt/schloss/

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