Passport of Expo 2015 MilanEach of the 145 participating countries is hosted in a self-built pavilion and is represented on the official Expo website. Some countries, such as Belarus,Belgium, Israel, or Germany, have created additional external websites. As part of the reciprocity protocol with Expo 2010 of Shanghai, on December 8, 2008, China was the first country to formalize its participation in Expo Milan 2015. The first country out of the reciprocity protocol to confirm its participation was Switzerland on February 3, 2011. As with other years, during this Expo visitors could purchase a passport onto which passport stamps could be placed.