Ключевые слова: asia, asian, cave, cavern, civil, complex, destination, dig, dong ha, dramatic, exploration, explore, geo, heritage, historic, historical, history, jungle, khe sanh, landmark, museum, mystery, north, people, quang tri, relics, scary, south, stone, travel, tunnel, tunnels, under, underground, vietcong, vietnam, vietnamese, vinh power, vinhmoc, war,