Jane Austen's "Emma" - what I think is the greatest work by arguably the greatest novelist in the English language. More modern favourites: Orwell's "1984" and Golding's "Lord of the Flies".
Do you include poetry? Poe's and Hopkins' head my (all-too-short) list.
As far as older and non-English stuff goes, I'm a great fan of (in no particular order) the Grimm tales (NB: they're NOT for children!), the complete "1001 Nights" (all four volumes!), the five-volume Arthurian cycle formerly attributed to Walter Map (c1140-c1209) and other medieval romances (Arthurian and otherwise) before Malory; Tolstoy's "War and Peace" and "Anna Karenina" (the Tristan and Isolde of the literary world), Zola's "Terese Raquin" (a sort of French equivalent), Flaubert's "Madame Bovary" and Lautreamont's Maldoror (the first surrealist novel).
Anselm
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"My fellow Americans: we begin bombing in five minu... hey, who put this microphone here?...."