...and I'm not actually referring to the totally amazing film starring Jennifer Connelly and David Bowie. At the moment

In the novel I'm working on, there is a forest that is an ever-changing labyrinth surrounding the castle my character needs to find. Keep in mind, she doesn't know she needs to find it. (OK, this is vague, I know) Does anyone know where I could find information on ways to get through a labyrinth? Ideally concepts that have roots in mythology, fairy tales, or folklore, ideally...