Related by context. Frequent words. (Click for all words.) 81 caves 60 cavern 56 Cave 56 Caves 53 mountain 53 caving 51 caverns 50 mine shaft 49 canyon 49 crevasse 48 tomb 47 mountainside 47 waterfall 47 gorge 47 mountains 45 burrow 45 subterranean 44 prehistoric 44 lair 44 archaeologists 44 crevice 44 glacier 43 crevices 43 hideout 43 ledge 43 hut 43 tombs 43 rock formations 43 excavations 42 castle 42 fossils 42 quarry 42 coal mine 42 dungeon 42 wilderness 42 underground 42 archeologists 42 climbers 42 mine shafts 42 volcano 42 monastery 41 mountaintop 41 burrows 41 boulder 41 hot springs 41 crater 41 cellar 41 igloo 40 grotto 40 sarcophagus 40 cliff 40 ark 40 underground tunnels 40 excavate 40 excavation 40 archeological 40 excavated 40 ravine 40 campsite 40 mine 40 cove 40 backcountry 40 entombed 40 mountaineers 40 Himalayas 39 lava 39 hiding 39 labyrinth 39 lizard 39 expedition 39 Crandall Canyon mine 39 mountainous 39 basement 39 tunnel 39 waterfalls 39 archaeological 39 mummified 39 dinosaur 39 mountaineering 39 trapped 38 tunnels 38 trapped miners 38 miners 38 woods 38 den 38 caved 38 attic 38 underground bunker 38 trapped underground 38 Machu Picchu 37 cliffs 37 hiker 37 sandstone 37 creature 37 passageway 37 passageways 37 cistern 37 observatory 37 creek 37 hermit 37 fort