I found The Girl Who Circumnavigated Fairyland in a Ship of Her Own Making to be incredibly imaginative and thought-provoking. It reads like a fairy tale, but has well-developed characters, an intriguing plot, and important themes. It combines the whimsical nature of Alice's Adventures in Wonderland and The Wizard of Oz with serious themes and ideas.
On her journey, the main character encounters many magical creatures and people and confronts the truth about herself and others. Though this book looks as though it is written for younger readers, I think that it can be enjoyed by people of all ages.