The Shanghai 2010 World Expo runs from May 1 to October 31, 2010, in Shanghai; it is the first Expo hosted by China. With an estimated 70 million visitors, it is the largest Expo (or World’s Fair) in history. A total of 242 participants will display at various pavilions at the Expo: 192 countries and 50 international organizations. Watch video slideshow featuring each country's pavillions here.