Daniel Defoe is great. Not just Robinson Crusoe, but also Moll Flanders (what a heroine!) and A Journal of the Plague Year, v. early reportage/fiction mash-up, and fascinating. I keep meaning to read Roxana and his non-fiction essays, but haven't got to it yet.
Oroonoko, by Aphra Behn (first English novel to feature a black central character, I think)
Dumas-Three Musketeers, Count of Monte Cristo, Man in Iron Mask, etc? I don't actually ever manage to finish Dumas, but worth a try.
I like Austen a lot, but I think Elizabeth Gaskell is better: North and South, Wives and Daughters, Cranford etc
C19th Ghost stories I love: M.R. James, Edith Wharton, Henry James.
Short stories by people you don't necessarily associate with them: years ago I read Chekov's, and Pushkin's, and enjoyed them enormously.
Buddenbrookes, by Thomas Mann.
Christ Stopped at Eboli by Italo Calvino.
Gosh, there are so many.