I have read the Anne of Green Gables books before, but recently have started reading them again.  L.M. Montgomery was an amazingly gifted writer who could hold her readers' attention with fun, humorous situations that her main character, Anne, was constantly getting herself into.  From accidentally getting her best friend drunk to smashing a slate over the head of Gilbert Blythe for making fun of her red hair, Anne is a character that readers can easily relate to, and sympathize with. 
I also liked that though they were written over a century ago, Ms. Montgomery's books are still finding readers who adore Anne, and keep reading her stories.  I think because the messages in them of friendship, courage, and good humor etc. are universal, and never get old.