The World's Fair of 1878, or Exposition Universelle, was held to celebrate France's prosperous return to the world stage seven years after the Franco-Prussian War. It was big, it was grand, it was modern. The glass-and-steel domes of the Main Exhibition Hall may look old-fashioned to our eyes, but it is still impressive for its airy joie de vivre. If you click on the image to the left, a link will take you to a French site with photos chronicling its construction. And, no, this isn't an April Fool's Day joke!