what book-series are a must read?

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this discussion is about titles and a short description about that title of the book, wherein that book is one of the book in a series. e.g. VAMPIRE ACADEMY. the first book in a 6-book series authored by Richelle Mead. this book is about vampires. the vampires are classified into three: the MOROI(the royals), STRIGOI(enemies of the royals and the vampires who kills humans), and the DHAMPIRS(half vampires and are the guardians of the royals). In this book, the MOROI and the DHAMPIRS are being put in an academy, wherein they can practice their powers and study about their origins, their rules and regulations of being that kind of vampire. now, what book-series can you recommend?