Fort Constantin or Fort Grand Duke Constantine is a historical fortress in Koblenz-Karthause district of Koblenz, Germany, built in 1827/1828. It was part of the Prussian fortress system of Koblenz and Ehrenbreitstein. It was named after the Grand Duke Konstantin Pavlovich of Russia. Currently it is a tourist destination managed by PRO KONSTANTIN e. V.
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Address: Koblenz, Germany
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