Paris Exhibition of 1889 - ( Exhibition) from Dome - right - View over building. Part of Box 119 Boswell Collection This exposition was on a far larger scale than any previously held anywhere in the world. It covered over 66 acres (270,000 m2), the main building in the Champ de Mars and the hill of Chaillot, occupying 54 acres (220,000 m2). The Gare du Champ de Mars was rebuilt with four tracks to receive rail traffic occasioned by the exposition.