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Sigmaringen Castle, Baden-Württemberg, Germany was the princely castle and seat of government for the Princes of Hohenzollern-Sigmaringen. The castle and its museums may be visited throughout the year, but only on guided tours. And it's on the Danube! by bitrot
Heidelberg is one of the few German cities that wasn't destroyed in World War II; plenty of old world charm fills the narrow cobble stone streets of its Old Town, which was the center for Germany's romantic period. The ruins of the once grand Heidelberg castle, the oldest university in the country, and the idyllic river valley make Heidelberg one of the most picturesque destinations in Germany.