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.
Starts out fairly well for the 1st 60 to 80 pages. However, nothing exciting really happens until the last 60 or 80 pages. In between, there's a lot of words spent describing a Lunar Utopia in which presumably folks read better than this fair-to-middlin' offering.
An Unknown World is of some interest historically: - as a contemporary sequel to the exploits of Jules Verne's Gun Club members (especially those in From the Earth to the Moon and Round the Moon). - because of Brian Stableford's footnotes putting the whole thing on a firmer footing for those unfamiliar with 19th Century science, literature, etc. - last but not least, I think that the idea of signalling the 3 initials of the astronauts all the way from the Moon to Earth is the inspiration for the same thing happening in the 1950s film called From the Earth to the Moon starring Joseph Cotton.