Ehrenbreitstein

Festung Ehrenbreitstein is a fortress. It was built on a mountain called Ehrenbreitstein on the right side of the Rhine opposite to the town of Koblenz in the German state of Rhineland-Palatinate.
It was built as part of the "Festung Koblenz" (Fortress Koblenz), by Prussia between 1817 and 1832 and guarded the middle Rhine region. This area had often been invaded by the French. The fortress was never attacked.