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Nothing provides an escape from the world quite like a great book. Even a book you've read dozens of times still has the power to transport you anywhere from the distant past to the far future, and the best books are definitely worth a reread or two (or a hundred). There's something very comforting about visiting familiar characters, and like your favourite movie, those beloved book series can instantly lift your mood (OK, maybe not the Dragon Tattoo books, but you know what I mean). Whether you'd like to escape to 18th-century Scotland, a school for witchcraft and wizardry, or the Upper East Side of Manhattan, here are 10 popular book series worth revisiting.