There are two dominant structures in the Disney theme parks, whether you’re in Florida, Tokyo, or Paris: castles and mountains. Each castle has its own story, and the same is true of each mountain. The Sleeping Beauty Castle in Disneyland is smaller than that of the Cinderella Castle at Walt Disney World — depending on how much size matters to you, that might make the original castle more or less impressive than the one in Orlando. But the castles at the Disney parks are largely visual icons. You can enjoy the novelty of, in Florida, eating inside a castle, but there’s no ride experience. The castles exist primarily as impressive landmarks.
The mountains are different. Just as actual mountains are challenges to climb up or down, the Disney mountains are exhilarating experiences intended as thrill rides. Though it wasn’t the first, Space Mountain is one of the most foundational and important to the overall modern experience at the Disney theme parks.