a great thread ! going back to the first posting in this thread about what we called the "bubble": "I remember going to the bottom of the Crystal Pool and entering the air dome made by a B17 plastic canopy. The canopy was chained to the bottom of the pool and air was pumped in from the bottom. The canopy trapped the air and floated about 3 feet off the bottom." could someone explain more about how it all worked, and about what a B17 canopy is, and how one could breathe under there -- for the non techical types ? I can't understand how if someone could get into it, then how could the air remain there ? I've wondered about how it all worked for so many years - never had the guts to even try to swim down to it myself and over the years its become one of those unexplained mysteries of childhood; maybe it would be better to let it be but after seeing this thread, got curious about it again. I do remember the skating rink - lots of fun, hokey pokey, bunny hop, and the birtthday party room that could be rented out. good comments about the postcard and the "hills" ; I don't recall even the pool area looking anything like the postcard but then the card doesn't show all the kids running around and hanging out. the tall floating pole I recall was called the "Bobber" and I think you could climb up to the top of it and swing back and forth on it. In the mid eighties I drove over there and walked towards the back of what had been the parking lot and discovered the pool was still there; I remember a big metal structure floating in the water and am guessing it was the Bobber. I tried to see if the bubble was still there but as per my comments in this post, really didn't know what I was looking for and perhaps it was still there under the deep end. thanks again for the memories.