As the world commemorates the start of the First World War, HARDtalk travels to Sarajevo, the capital of Bosnia Herzegovina, to speak to Karl von Habsburg - grandson of the last of the Habsburg emperors. It was in Sarajevo that his great uncle Archduke Franz Ferdinand was assassinated in June 1914, an event which set the Great War in motion. Stephen Sackur hears his reflections on Europe then and Europe now.