Beautiful photos of the most impressive German castles that were home to royals, lords, knights, and noblemen.

More than 25,000 castles crown the hills of Germany, so it can be difficult ... between the cities of Mannheim (52 miles south of Frankfurt) and Bayreuth (55 miles northeast of Nuremberg).

National Geographic-Lindblad Expeditions just launched two new river cruises, sailing in Belgium, France, Germany, ...