In this unofficial sequel to Jules Verne's From the Earth to the Moon, astronomer Francois Mathieu-Rollere, Lord Douglas Rodilan and two Frenchmen, Marcel and Jacques, purchase the giant cannon and shell used by the Gun Club to send the first men into space and launch their own expedition to the Moon. Once there, they encounter the advanced, utopian civilization of the Meolicenes who live inside our satellite. Written in the 1880s, A World Unknown is remarkable because of the author's ardent desire to imagine and describe things that no one had ever imagined or described before, in the quest to widen the horizons of human imagination.