Take a look at this awesome video about moving the Perth Megamouth. I always loved visiting the Megamouth when I was a kid, and I was sad to see it had moved (I didn't know where).
But now it's in Fremantle! Sadly the Fremantle Maritime Museum cost money to get into :( it's only $10 but it's still strange having to pay to get into a museum (I usually donate a few dollars when I go inside a museum anyway)
There used to be a HUGE whale skeleton in the old Perth Museum, but it's been put into storage until they can build another building. I can't wait to see the whale skeleton again, it was my favourite when I was a kid.