Hohenzollern castle by @sebastianoochristian in Baden-Württemberg, Germany, Hohenzollern Castle is one of the most breathtaking hilltop fortresses in Europe. Originally built in the 11th century, it served as the ancestral seat of the powerful Hohenzollern family the dynasty that later ruled Prussia and the German Empire. The present castle, completed in the mid-19th century under King Frederick William IV of Prussia, is a masterpiece of neo-Gothic architecture. With its soaring towers, grand co