Ключевые слова: ancient culture, archeology, asia, bay, bo hon island, cave, colorful, destination, geological, geology, grotto, ha long bay, halong bay, historical, iceland, landscape, mountain, nature, nonurban, outdoors, prehistory, seascape, stalactite, stalagmite, tourism, travel, trinh nu, trinh nu cave, vacation, vietnam, view, virgin cave,