Kaltenburg Castle is a ruined castle, located in the Lonetal between the cities of Giengen and Niederstotzingen in the district of Heidenheim, Baden-Württemberg, Germany. The castle was built during the High Middle Ages and though ruined, most of the walls are intact.
The ruin is situated about 60 m above the confluence of the Hürbe and Lone rivers in the Lone valley. About 500 m north of the castle is the Charlottenhöhle one of the longest caves in Schwäbischen Alb.
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