Any of Terry Pratchetts Discworld Novels.
Any of Iain M. Banks "Culture" novels - and " The Algebraist". Oh, and most of his non Sci-Fi fiction, like "The Wasp Factory" and " The Crow Road".
Any of Martin Cruz Smiths "Arkady Renko" series of detective novels, like "Gorky Park", "Polar Star" etc.
Milan Kundera "Unbearable Lightness of Being"
Umberto Eco " The Name of the Rose". "Foucaults Pendulum"
George McDonald Frazer - All of the "Flashman" novels.
Robert Tressell " The Ragged-Trousered Philanthropists"
Michael Marshall Smith " Only Forward", "One of Us"
Ed McBain - Any of the 87th Precinct police procedurals.
Elmore Leonard - Pretty much any and all of his books.
Bill Bryson - " A brief history of nearly everything "
Ben Goldacre - " Bad Science", "Bad Pharma"
Richard Feynman - " Surely you are joking, Mr. Feynman"
Carl Sagan - "Cosmos", "Daemon Haunted World"
Gabriel Garcia Marquez " Love in a time of Cholera", "One Hundred Years of Solitude"
Dava Sobel - "Longitude"
And very fond childhood memories of any book by Gerald Durrell...