Thien Cung Grotto (Heavenly Cave) is situated on Dau Go Island (Wooden Stakes Island) in the southwestern Halong Bay and about 4 kilometers from tourism wharf.

Thien Cung Grotto is at the height of 25 meters above the sea level. Visiting the grotto, tourists will feel like visiting an art museum with variety of sophisticated statues and reliefs. In the center of the grotto, there are four big pillars propping against the roof.

The original inhabitants of Halong Bay have told an ancient story about Thien Cung Grotto over many generations. The story is told that Dragon Prince was fallen in love with “Nang May” (Ms. Cloud). They held a lavish wedding party inside the grotto in 7 days and 7 nights. All kinds of animals and all genies took part in to share happiness with the couple. The celebration was that fun and bustling like on the heaven. Nowadays, entering Thien Cung Grotto, visitors can gaze party sceneries in the setting of stalactites and stalagmites inside.

The grotto has been discovered recently by explorers. Thien Cung Grotto is considered as one of the most beautiful caves of Halong Bay.