Niels Klim's Journey Under the Ground, is a satirical science-fiction/fantasy novel and is also the only novel written by the Norwegian-Danish author Ludvig Holberg. It describes a utopian society from an outsider's point of view, and often pokes fun at diverse cultural and social topics such as morality, science, sexual equality, religion, governments, and philosophy.
Click on any of the links above to see more books like this one.