Thien Cung Cave is located on Mutou Island in Halong Bay, Vietnam. It is a typical karst cave. The cave is about 20 meters high and covers an area of ​​3,000 square meters. The cave is full of giant stalactites with strange shapes, such as fairies and golden hoop sticks. The colorful lights are like a dream, which is a beautiful scenery that cannot be missed in Halong Bay.