Hohenzollern Castle, Germany

Perched dramatically atop Mount Hohenzollern at 855 metres above sea level in the Swabian Alps, Hohenzollern Castle is the ancestral seat of the House of Hohenzollern, the dynasty that produced the German Emperors and Kings of Prussia. The current castle, built between 1846 and 1867, is the third structure on the site. It houses the Prussian Crown Jewels and the famous painting of Frederick the Great, and receives 350,000 visitors annually.