Ключевые слова: adventure, ancient, antique, archeology, attraction, calcite, cave, cavern, dark, destination, earth, formation, formations, geologic, geological, geology, gokgol, grotto, hole, humid, indoor, inside, interior, landscape, light, limestone, magara, mineral, moist, mountain, mystery, natural, nature, old, rock, rocky, scary, sight, speleology, stalactite, stalagmite, stone, structure, tourism, tourist, travel, tunnel, turkey, underground, zonguldak,