One of the great things about Minecraft is that you can pack a level into one nice compressed archive. r/Minecraft on Reddit have a number of servers (I think) and this is one of them. You can download that world from here, it’s pveRev6.tar.gz but there are lots of other worlds there to check out too.
I had to fiddle around a bit to get creative mode working. I think I copied the region folder from the tarball into a creative world I created for this purpose. There was probably one or two other steps too but it’s been a while. Figuring out stuff in Minecraft is half the fun isn’t it anyway so go find out yourself 🙂