Logan's Run (the 70s movie with Michael York and Jenny Agutter). That totally cool transparent tubular train system whizzing through the futuristic city. I would kill to ride on that! Check it out on youtube if you don't believe me.
There are a lot of cool scenes in the movie that would translate into a dark ride, such as the nursery, the carousel dance where people are bumped off, the ice cavern where runners are caught and frozen for food, the waterfalls, and the last scene where the heroes escape into the sunlight and meet the wise old man.
And the absolutely greatest thing about the movie:
NO CG effects !!!!
(but there is a cool hologram effect where Michael York tells the computer that runs his world, "THERE IS NO SANCTUARY")