The boyfriend and I have been trying to come up with a number of fictional characters that fit the following criteria:
A (child, or group of children), who (somehow travel to a mystical and fully-developed world), where they (meet and have adventures with a number of strange characters), and who (eventually return to the real world), finding that (no one believes their story).
So far, we thought of:
The kids from the Chronicles of Narnia
The kids from Peter Pan
Sarah from Labyrinth
Bastian from The Neverending Story
Jack and the Beanstalk maybe?
It's okay if they're not hugely well-known characters, as long as they're not from recent sources (i.e., folklore and mythology are fine, as long as they fit all the criteria).