Viaje al mundo subterraneo is one of the happiest satirical utopias in literature. The novel describes the journey of Niels Klim, who, like Alice, falls through a hole in the Earth and discovers that the interior of the Earth is a hollow space, with a central sun and small planets that orbit it. Captured by a dragon, he ends up on one of the planets, Nazar, and there he discovers the utopian civilization of the Potuans who, as a distorting mirror, serves to elaborate one of the fiercest satires on the human condition.