Related by context. Frequent words. (Click for all words.) 64 cliff dwellings 61 Chaco Canyon 61 petroglyphs 60 Canyon de Chelly 59 Anasazi 58 lava tubes 58 pictographs 57 petroglyph 57 rock outcrops 57 ancient 56 archeological sites 55 archaeological sites 54 prehistoric 54 Mesoamerican 54 ancient civilizations 54 limestone caves 53 archeological 53 Paiutes 53 archaeological finds 53 prehistory 53 burial mounds 52 artifacts 52 landform 52 Kennewick Man 52 middens 52 caves 52 Hohokam 52 archaeological 51 Mayan 51 pre Columbian 51 ancient Mayan 51 Pre Columbian 50 antiquity 50 Paleolithic 50 Incan 50 Mesa Verde 50 Kumeyaay 50 Native Americans 50 Archeological 50 archaeological artifacts 50 Burgess Shale 50 burial grounds 50 limestone cave 50 paleontological 50 landforms 49 Egyptian pyramids 49 Ancient Roman 49 cairns 49 adobe walls 49 royal tombs 49 Mesoamerica 49 relics 49 Prehistoric 49 Ancient 49 Incas 49 flora fauna 49 Bronze Age 48 classical antiquity 48 ancient civilization 48 Chihuahuan Desert 48 megalithic 48 Hopis 48 ancient Mesopotamia 48 Miwok 48 Paiute 48 lava tube 48 hot springs 48 Sassanid 48 buttes 48 Artifacts 47 Archaic 47 geologic 47 Native American 47 redwood forest 47 pueblo 47 ancient ruins 47 tombs 47 ancient relics 47 stone carvings 47 millennia 47 vernacular architecture 47 Superstition Mountains 47 Pueblos 47 Sonoran Desert 47 arroyos 47 butte 47 monuments 47 Chiricahua 47 Spanish conquistadors 47 ancient Mayans 47 fossils 47 Jemez Mountains 47 ancient temples 47 stromatolites 47 Palenque 47 midden 46 millenniums 46 ancients 46 sagebrush habitat 46 cenotes 46 archaeological ruins