Thanks for the memories. Would go to the gardens on field trips when I was a kid 50 years ago. I recognized some things but it looks like it has changed a great deal since then.
@HorseloverFat thought you might enjoy some of these pics.
EDIT: BTW the biggest pipe for the organ is wooden, from some pine trees in California that are 3" thick
if I hadn't mentioned that,... and IIRC 32' tall, playing @16Hz WOW!