Thien Cung Cave (Heavenly Palace Cave) was discovered in 1993. It is located in the North of Dau Go island about 4 km away from the Bai Chay Tourist Port. Situated 25 meters above sea level, Thien Cung Cave is the most glorious cave in Halong Bay which can be accessed through a narrow gate. The deeper tourists go into the cave, the more surprised they are by the splendor of many stalactites inside.