civilization 40 history 13 culture 9 extraterrestrial civilization 8 society 8 history of civilizations 6 religion 6 more ... innovation 5 technological progress 5 engineering 5 science 5 dějiny civilizace 4 history of civilization 4 prehistory 4 antiquity 4 environment 4 architecture 3 civilization 3 geography 3 hydraulic structures 3 cosmology 3 history of culture 3 civil engineering 3 technology 3 artificial intelligence 3 Creation (religion) 2 Ancient civilization 2 travelling 2 demography 2 exobiology 2 less ...