I haven't actually left any worlds behind, but the title of this post just leaped from fingers to keyboard and so there it sits, perhaps as impetus to add 75,000 or so more words to a future novel. Sure, sure, big talk...I'm not giving up, though. One day, if I'm not felled by fate first. Literate alliteration! Nice.
I haven't left these worlds behind, but I'd visit them at the drop of a hat:
John Carter's Mars
Serge Storms' Florida
Shirley Jackson's Hill House
Stephen King's Maine (as long as I was guaranteed safe passage)
There are so many more. I may never finish my novel or screenplay, but I wouldn't have even started if it weren't for the inspiration of the many imaginative people, famous and not, who pushed me into trying to build worlds of my own, if only half-realized.