Favorite Classic Book

I'm going to reach way back into history and select Little House on the Prairie as my favorite classic book.  I still have so many fond memories of reading the Little House series (possibly solidified by the TV show).  I feel like this book has informed my lifetime reading preferences in many ways.  I'm still a sucker for books about the immigrant experience in any form it might take.  I love the uncertainty that comes in these novels, where the characters are constantly surprised by their new experiences.