Narnia is a fictional realm created by C.S. Lewis in The Chronicles of Narnia. It is a place you cannot get to by wishing; rather, it finds you when the time is right. Also, time does not flow there in parallel to time on Earth. When Lucy was away having tea with the Faun, she hurried back and shouted, "Here I am! Sorry to worry you!" (or words to that effect) but they thought she was only playing because for them only a few moments had passed in a round of hide and seek. This became an important plot point, because one of the reasons the old Professor believed her story is that a child her age would be unlikely to make up a story involving the passage of a long period of time.