What's your favourite book of all time?

I grew up reading Enid Blyton's The Faraway Tree collection and would love to introduce that to the kids. It's such a magical place (in my young mind) with the Enchanted Woods and interesting adventures with Moonface, Saucepan Man and Silky etc. I have a vivid imagination, and combined with the good writing, reading this series was like being transported to another place. As I grow up, the Harry Potter series is another of my all-time favourite.