Fictional worlds we wanted to inhabit as children

Did you become so entranced by a fictional world in one of your childhood books that you wanted to live there? For me, as a younger child, it was the bucolic world of The Wind in the Willows. I drew pictures from the story, trying to immerse myself in those riverside scenes. As an older child, it was the Middle Earth of The Hobbit (and, later, The Lord of the Rings). Coincidentally, both stories feature characters who live in holes in the ground.