Hohenbaden Castle - Credit: Wikimedia Commons
Hohenbaden Castle (at the time of its establishment Schloss Hohenbaden, now Old castle or Altes Schloss) in German Baden-Baden was the residence of the margraves of Baden for almost 400 years. The castle was built around 1100 by Herman II, Margrave of Baden (1074–1130) on the west flank of the Battert rock. Read more on Wikipedia
Source: en.wikipedia.org