![](http://upload.wikimedia.org/wikipedia/commons/thumb/8/8e/MainBuilding.jpg/100px-MainBuilding.jpg)
... that the Main Exhibition Building of the Centennial Exposition of 1876, a temporary structure, was the largest building in the world by area, enclosing 21.5 acres (8.7 ha)?
... that the Main Exhibition Building of the Centennial Exposition of 1876, a temporary structure, was the largest building in the world by area, enclosing 21.5 acres (8.7 ha)?