I've been thinking about what I'd recommend that no one has mentioned. A really good and accessible book since it's available here at Mobileread. I think I'd recommend
The Professor Challenger Adventures, specifically
The Lost World. Would you consider dinosaurs in the Amazon, sci-fi or fantasy?
It's funny, I read and really enjoyed the complete Sherlock Holmes so many years ago. And shortly thereafter I discovered he's written some books that I'd read as Classics Illustrated much earlier, The White Company and The Lost World. Yet I've never had the desire to reread Sherlock but I bet I've read the other two at least twice each.