Oh, I remember that. It scared me, too. I was young, but I think the Carousel of Progress exited into that because I was too small to see what was happening, but I always cupped my hands over my ears because of the loud noise. I wouldn't have gone into it if something else didn't exit through it.
I also still have two decks of World's Fair playing cards from back then, that my grandparents had.
-PJ
Yep it was part of the same exhibit, different section.
I cried when we had to go home, I loved that stuff. Same with Disney, a high school senior all teared up over Tinkerbell, sheesh, those innocent days before I started to see political demons in everything, take me back.