Expo '70 [Asahi newsreel] The 1970 World's Fair -- a.k.a. Expo '70 -- opened in Osaka 40 years ago this week. A total of 77 countries attended the event and the number of visitors surpassed 64 million people, making it one of the largest and best attended expositions in history. This was the first World's Fair to be held in Japan, a nation that had experienced an extremely rapid period of developm