Which must interesting to the core... All Genre are welcome, Only one criteria: it Should Big, Fat and Interesting to the core with much number of pages.
I've enjoyed books by James Michener. I read Hawaii years ago and recently read Centennial (about Colorado). Now I'm almost done with Texas.
All are huge books backed by tons of research into supporting detail. They're fiction, but historically inspired. His book Tales of the South Pacific inspired the movie.