Fifty years ago this week, Space Mountain opened in Magic Kingdom at Walt Disney World. The original Space Mountain, which opened at Walt Disney World in 1975, was the first fully-enclosed, dark roller coaster and the first to be controlled by a computer.

When the ride opened on Jan. 15, 1975, an Apollo moonwalker was its first passenger, NASA's insignia was on display and Space Mountain was dedicated to opening the new frontier.

Space Mountain, at Walt Disney World! Celebrate the magic of milestones at Walt Disney World this year and reminisce about your own Disney childhood milestones.

Space Mountain in Walt Disney World celebrates 50 years of operation. Initially opening on 1975, Space Mountain, an indoor steel rollercoaster themed to space travel, has been a staple of Tomorrowland,