Expo 2010 Paris, China 1889 and Expo 2010 Paris 1889.

Someone in China witnessed the glory of 1889 Paris World Expo. He is Zhang, who served as the minister of the Qing government in the United States, Spain and Peru. When Zhang arrived in Paris, he visited the "dazzling" World Expo accompanied by others. He personally climbed the tower and enjoyed the scenery of Paris. He described the structure of the tower in detail in his diary and bought postcards with pictures of the tower as a souvenir. This set of postcards is the earliest photographic postcard in the world, and now it has become a rare treasure.

1889 During the Paris World Expo, two conferences were held to discuss social issues, and resolutions were passed at the conferences to designate May 1 day as International Labor Day every year.