Pillars of the Earth by Ken Follett

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If you like historical fiction and you haven't already read all the books in Oprah's book club (this was one), you'll love Pillars of the Earth by Ken Follett.  It's the story of the building of a great cathedral during medieval times, and the life stories of all the interesting people involved in that endeavor.  A smart and ambitious monk, a skilled stone mason, a clever young lady, an evil bishop, and so much more.  Really absorbing (and really long!).