Ключевые слова: ancient, antique, archeology, artificial, attraction, calcite, capillary, catacomb, cave, cavern, dark, earth, entrance, exit, geological, geology, grot, grotto, history, hole, humid, indoor, inside, interior, light, mineral, moist, mountain, natural, nature, old, outlet, palaeolithic, road, rocky, rubble, sight, sightseeing, speleology, stone, stonework, structure, subterranean, surface, tourism, tourist, travel, tunnel, underground,