From London 1851 to Paris 1900, "in excess of 200 million visitors had entered the turnstiles in London, Paris, Vienna, Philadelphia, Chicago and a myriad of smaller shows around the world."
从1851年的伦敦到1900年的巴黎，“超过两亿的参观者踏入了伦敦、巴黎、维也纳、费城、芝加哥世博会以及世界各地的其它小型展會的大门。