The Paris International Exposition in 1867, also hosted by Napoleon III, was held in an enormous oval exhibit hall 490 metres long and 380 metres wide in the Champ de Mars. Famous visitors included Czar Alexander II of Russia, Otto Von Bismarck, Kaiser William I of Germany, King Louis II of Bavaria and the Sultan of the Ottoman Empire, the first foreign trip ever made by an Ottoman ruler. The Bateaux Mouches excursion riverboats made their first journeys on the Seine during the 1867 Exposition.[158]