Niels Klim's Journey under the Ground - Ludvig Baron Holberg

Niels Klim's Underground Travels, originally published in Latin as "Nicolai Klimii Iter Subterraneum" (1741) is a satirical science-fiction/fantasy novel written by Ludvig Holberg, a Norwegian-Danish dramatist, historian, and essayist, born in Bergen, Norway. It was his first and only novel. It describes a utopian society from an outsider's point of view, and often pokes fun at diverse cultural and social topics such as moral, science, sexual equality, religion, governments, and philosophy. (Summary by Wikipedia)