Ключевые слова: age, ancient, archeology, bear, calcite, candle, cave, cavern, column, dark, earth, environment, gallery, geologic, geology, grotto, ground, hall, history, landmark, light, mineral, mountains, natural, nature, old, rock, romania, spelaeus, speleologist, stalactites, stalagmites, subterranean, tourism, trapped, travel, trekking, under, underground, ursus,