Beginning in the 1960s, the area was designated for development. Construction of the city centre, the University of Tsukuba and 46 public basic scientific research laboratories began in the 1970s. Tsukuba Science City became operational in the 1980s. The Expo '85 world's fair was held in the area of Tsukuba Science City, which at the time was still divided administratively between several small towns and villages. Attractions at the event included the Technocosmos, which at that time was the world's tallest Ferris wheel.