Niels Klim's Underground Travels, originally published in Latin as Nicolai Klimii Iter Subterraneum (1741), is a satirical science-fiction/fantasy novel written by the Norwegian–Danish author Ludvig Holberg. His 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 morality, science, sexual equality, religion, governments, and philosophy.