Space Mountain
Walt Disney originally conceived the idea of a space-themed roller coaster for Disneyland following the success of the Matterhorn Bobsleds, which opened in 1959. However, a number of factors including lack of available space, Walt Disney's death, and the Disney company's focus on building what would become Walt Disney World led to the project's postponement in the late 1960s. After the early success of the Magic Kingdom park at Walt Disney World, Disney revived the Space Mountain project and opened the first Space Mountain at the Magic Kingdom in 1975. Soon after, Disney began plans to build a smaller version of Space Mountain at Disneyland, and opened Disneyland's Space Mountain in 1977. The design of Disneyland's Space Mountain was replicated at Tokyo Disneyland in 1983 and Hong Kong Disneyland in 2005; the Tokyo version was significantly changed in 2006 to become more similar to the refurbished 2009 Magic Kingdom version.