I know Milwaukee had THREE on the southside alone. I lived a block from one. Some days were "girls" days and son some were "boys" days.
For some reason when we were small my friends and I pronounced it Nadatoriums. So we`d always say, "Let`s go to the Nad".
I remember getting a chance to go inside the one on 10th and Hayes before they tore it down.
It looked SO MUCH smaller then when I was a kid. AND, once it was torn down, the empty lot left never looked big enough to have ever had a building that had a swimming pool in it ever on that site.