 The fair opened on 28 April 1906, ran until 31 October and marked the opening of the Simplon Tunnel.The fair was held in Sempione Park and Piazza d'Armi', with the first location hosting fine arts displays and the latter industrial and engineering exhibits, along with the foreign pavilions.Countries contributing included many from Western Europe, China, Japan, Turkey, United States, Canada and several South American countries shared a pavilion.