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Other notable pre-20th century examples include Giacomo Casanova's 1788 Icosaméron, a 5-volume, 1, 800-page story of a brother and sister who fall into the Earth and discover the subterranean utopia of the Mégamicres, a race of multicolored, hermaphroditic dwarfs ; Symzonia: A Voyage of Discovery by a " Captain Adam Seaborn " ( 1820 ) which reflected the ideas of John Cleves Symmes, Jr .; Edgar Allan Poe's 1838 novel The Narrative of Arthur Gordon Pym of Nantucket ; Jules Verne's 1864 novel A Journey to the Center of the Earth, which described a prehistoric subterranean world ; and George Sand's 1884 novel Laura, Voyage dans le Cristal where unseen and giant crystals could be found in the interior of the Earth.