The problem i have with Oz though is that Dorothy was bonked on the head and it was a dream, without Oz being a real place, a secondary universe the myth is shattered. Film is almost perfect for me but for the ending.
But then Dorothy went back to Oz in the 80s, had some more adventures, then returned to Kansas again, but this time the existence of Oz is at least ambiguous. Also, one time Diana Ross ended up in Oz where she met Michael Jackson.