During his academic career he participated in several study trips to Italy, Sicily, Greece, et al., and in 1852 accompanied Ludwig Preller (1809–1861) and Hermann Theodor Hettner (1821–1882) on a journey to Greece and Constantinople.
Karl Marx | Wilhelm II, German Emperor | Wilhelm II | Wilhelm Reich | Gottfried Wilhelm Leibniz | Karl Pilkington | Karl Lagerfeld | Karl G. Heider | Karl Rove | Karl Pearson | Karl May | Karl Liebknecht | Karl Friedrich Schinkel | Karl Dönitz | Karl Jenkins | Karl Stefanovic | Georg Wilhelm Friedrich Hegel | Wilhelm Keitel | Karl Bodmer | Friedrich Wilhelm Joseph Schelling | Wilhelm Furtwängler | Karl Wilhelm Friedrich Schlegel | Karl Malone | Wilhelm Wundt | Karl Wolf | Karl Valentin | Karl Popper | Karl Malden | Karl Kesel | Karl Barth |