Ключевые слова: abandoned, adventure, ancient, awe, backgrounds, below, black, cave, caverns, cliff, crag, danger, dark, exploration, formations, geology, granite, grotto, history, hole, islands, landscape, large, light, limestone, mine, mineral, mining, mountains, mystery, natural, nature, nobody, old, outdoors, past, rocks, scenics, science, shade, shadows, space, stalactites, stalagmite, stone, sunbeam, time, travel, underground, volcanoes,