I am surprised that people did not mention Jules Verne. I believe that his books would be deemed appropriate by most people.
While much of “so-called” Jewish literature is neither Jewish nor literature, but rather “light reads” without the objectionable material, there are good Jewish books for those who are looking for them. May I suggest “Wildflower” and “Blue Star over Red Square”? (Parents – I suggest that you are attentive to even “Jewish” books to ascertain that they fit in with the chinuch you desire for your children. Some of the very best are still not appropriate for everyone.