In Sarajevo, the point of triangulation is the scene of another assassination, the spot outside the City Museum at which ul Zelenih Beretki meets the river, where, on 28 June 1914, the Archduke Franz Ferdinand and his wife Sophia were shot dead by the Serb nationalist Gavrilo Princip, precipitating the First World War. A plaque bearing Princip’s footsteps used to be set in the pavement there, but it was ripped out by Muslims during the war.