Pirates of the Caribbean was the last attraction at Disneyland where Walt Disney had input in the design process. The initial designs had the attraction as a walk-through wax museum. The 1964 World’s Fair, however, changed those initial designs. Mr. Disney and Walt Disney Imagineering designed the highly popular It’s a Small World and the audio-animatronics behind the Great Moments with Mr. Lincoln.
From a story-telling perspective, the audio-animatronics and the regulated pace of a boat ride would bring the story of the Pirates of the Caribbean to life more than people walking, at their own pace, through a museum. As a result, the designs for the attractions were scrapped and replaced with the Pirates of the Caribbean attraction which we see at Disneyland, Walt Disney World, Disneyland Paris, Tokyo Disneyland, and coming later this year to Shanghai Disneyland Park.