This is a fun poll I came up with from bordom. There have been 3 things in that building: First was Carousel of Progress, second was America Sings, and currently Innoventions. Which of those was the best thing to fill that building? You can also say "empty" for those who think that building is a waste.
Carousel of Progress (1967-1973) no video of DLR version but there is of WDW version: YouTube - Magic Kingdom Carousel of Progress
America Sings (1974-1988) videos: YouTube - America Sings Farewell (part 1) YouTube - America Sings Farewell (part 2)
Innoventions (1998- Present)