Well, I'm diving into a classic that - I must admit - I have never read. 
"20,000 Leagues Under the Sea" by Jules Verne. 
I hate to make a terrible pun, but the book is a little drier than I expected.  a lot of scientific information about oceans, aquatic plants, fish, etc.  Not a bad book - but different from what I expected.  then again, it's a very old book that was written in French and translated to English.  I get the sense that Verne was trying to make it as realistic as possible. 
(I was at my mother's house last summer and found a lot of old books from my high school days.  That included a book of HG Wells stories and a book of Jules Verne.  For some reason, never read the Verne book)