A WRINKLE IN TIME, Madeleine L'Engle
THE LION, THE WITCH, AND THE WARDROBE, CS Lewis
HARRY POTTER (because it's really all one book, split into seven), JK Rowling
because they resonate with me more than anything else, because they've held up under multiple readings, and because they hit me in all the places that make me feel and make me wish I could do that in writing as well.