The attraction officially opened on October 1, 1983, as part of Phase II of Epcot. Horizons originally closed in 1994 after General Electric ended sponsorship of the attraction. It was temporarily reopened in 1995 due to the closure of other attractions for refurbishment in "Future World." The attraction permanently closed on January 9, 1999, after which the attraction was dismantled and its structure demolished to make room for Mission: SPACE, a motion simulator thrill ride that opened on October 9, 2003.
Horizons, in its concept phase, was named Century 3 (or Century III), to recognize the third century of American existence (1776–2076). The name was changed to Futureprobe to help appeal the attraction toward international guests who wouldn't understand or appreciate Century 3. In the end, the Futureprobe name was scrapped due to the medical connotation of the word "probe". After much debate, GE and Disney officials settled on the name Horizons. Prior to the start of construction, the project's budget was slashed by $10 million (USD). The building size was reduced and the length of the ride was shrunk by 35%, shortening the ride length by 600 feet (180 m). Horizons opened exactly one year after Epcot opened and was located between World of Motion and the Universe of Energy. The Wonders of Life pavilion became Horizons' new neighbor in 1989, and World of Motion closed in 1996. Horizons remained operational until World of Motion's successor, Test Track, was ready to open to the public in early 1999.
It was proposed that Horizons would be the sequel to the Carousel of Progress, Disney's ride from the General Electric Pavilion at the 1964 New York World's Fair. As the Carousel of Progress followed the changes in lifestyle that faced a family as they lived through the 20th century, Horizons continued their story, showing how they might live in the 21st century. The Carousel's theme song "There's a Great Big Beautiful Tomorrow" was part of the Looking Back at Tomorrow portion of Horizons. The version of "There's a Great Big Beautiful Tomorrow" that could be heard in Horizons coming from a television in the Art Deco scene is the exact version that can still be heard on a radio during the first act of the present Carousel of Progress. The original ride concept came from Reginald Jones (then CEO of GE) and Jack Welch (future CEO of GE). The concept was to focus on Thomas Edison and his body of work along with the origin of General Electric; it was changed to focus on the future of America, a theme that changed yet again to respect that Epcot was to appeal to a global audience. The building which housed Horizons was designed to resemble a spaceship, while accentuating the third dimension and giving the impression of an infinite horizon.
During the early 90s, after GE had dropped sponsorship, some ideas were tossed around about the pavilion being turned into a space-themed pavilion. The building would have been upgraded and rethemed. The ride system would be changed drastically, in which the guest would be in an individual space harness while viewing space stations and space in general and would control the pitch and yaw of the vehicle. Sadly, on January 9, 1999, Horizons closed permanently. No reason was publicly given, but the lack of corporate sponsorship probably played a large part in the decision. It is also claimed that one of the reasons for the attraction closing was major structural problems (that being a large sink-hole underneath the structure which emerged in 1998), along with problems with the roof. The building was claimed to have been close to collapsing under its own weight and stood unoccupied for well over a year as Disney decided between either relaunching the attraction (which would have required a new storyline and major building renovation and upgrades) or demolishing the building and creating a new attraction in its place. It was decided to build a new cutting-edge outer space-themed attraction, so the Horizons building was slowly torn down in July 2000. The demolition of the building marked the first time in Disney history that an entire ride building had to be demolished in preparation for a new attraction. Construction on Mission: SPACE began in late 2000 and the new attraction opened in 2003.
Here now for your enjoyment is a tribute and ride-through of Horizons: