Halong Bay, one of the most popular attractions in Vietnam, also a UNESCO World Heritage, is both magnificent and mystical, which is an unbelievable feat of the Mother Nature that nearly never fails to impress. Halong Bay has thousands of limestone islands, mountains, grottoes and caves so there is very diverse natural landscape, varying from long sandy beach to thousand-year-old-lime kars such as: Thien Cung, Dau Go, Sung Sot, Trinh Nu, Cat Ba isalnd, etc