The Lion, The Witch, and The Wardrobe is a book by C S Lewis. It is from a series of books, The Chronicles of Narnia. Narnia is a magical land and to get there you can only go through magical portals, such as a wardrobe, a picture frame, or in this case, a crack in a piece of oak. The lamppost is a big part of the story, and a faun named Mr. Tumnus left the foot/hoof prints.