Example image of eyePlorer eyePlorer map for 'Strata (novel)': Geology Stratum Strata Science fiction Terry Pratchett The Dark Side of the Sun Discworld Discworld (world) Earth Fantasy Larry Niven Ringworld Planetary engineering Out-of-place artifact Flat Earth Eastern Hemisphere Middle Ages Americas Leif Ericson Moon North America Roman Empire Romulus and Remus Venus Viking The Carpet People Barometer question Pastiche Space elevators in fiction Omphalos hypothesis List of extraterrestrials in fiction by type 1981 in the United Kingdom Planets in science fiction