Why were Hitler, Stalin and Trotsky in Vienna in 1913?
Hitler, Stalin, Trotsky, Freud, Jung, Tito - some of the most influential and some might say infamous figures who shaped the history of the 20th century.
A hundred years ago they were all living in central Vienna and possibly rubbing shoulders with each other in the café society that thrived there.
So how did these very disparate men end up living in such close proximity to one another?
Speaking to Today presenter John Humphrys, Charles Emmerson, author of 1913: The World Before the Great War, and Professor Dardis McNamee, editor of the The Vienna Review, discussed the appeal of Vienna in 1913.
First broadcast on BBC Radio 4's Today Programme on Thursday 18 April 2013.