I reread pretty much everything I liked the first time around, but there are some books I have read several times already and read again at least in parts whenever I feel depressed and awful and need a way to escape. These are Tolkien's Lord of the Rings, Anne Rice's Vampire Chronicles I, II, and IV (because all other parts are awful), Marion Zimmer Bradley's Mists of Avalon and Mary Renault's Fire From Heaven and The Persian Boy.