Hohenzollern Castle perched atop the Swabian Alps, in Baden-Württemberg, Germany, seen here during the different seasons. With over 350,000 visitors per year, Hohenzollern castle is one of the most visited castles in Germany. This castle is the ancestral seat of the historically significant, imperial German House of Hohenzollern, who own the castle to this day, though they do not actually reside there. The castle that we see today was built between 1846 and 1867 as a family memorial by the Hohenzollern scion King Frederick William IV of Prussia.