Visitors arrive at the North Korea pavilion, at left, and the adjacent Iran pavilion at the 2010 Shanghai Expo. It is the first time that North Korea has participated at a World Expo. The Expo officially opened May 1, 2010, and organizers expect the six-month-long event to attract close to 70 million people. (Peter Trebitsch / EPA)
A colorfully attired visitor ponders the spectacular exterior of the United Kingdom Pavilion. (Eugene Hoshiko / Associated Press)
Despite the drizzly weather, Expo-goers are entertained by European parade performers last month on Europe Day at the Expo. (Lu Xin / EPA)
Visitors enjoy a slide inside the Swedish Pavilion last month. Organizers expect an average of 380,000 visitors to the Expo daily -- most of them Chinese. (Philippe Lopez / AFP / Getty Images)
Australian Foreign Minister Stephen Smith visits his country’s pavilion during inauguration ceremonies for the site at Shanghai Expo 2010. (Philippe Lopez / AFP / Getty Images)
Visitors stroll inside the mirrored Barcelona Pavilion at the 2010 Shanghai World Expo. (Diego Azubel / EPA)
