Hang Dau Go (Grotto of Wooden Stakes): Know to French as the Grotto des Merveilles (Cave of Marvels), is a huge cave consisting of three chambers, which you reach via 90 steps. Among the stalactites of the first hall, scores of gnomes appear to be holding a meeting. The walls of the second chamber sparkle if bright light is shone on them. The cave derives its Vietnamese name from the third of the chamber.
This chamber is said to have been used during the 13th century to store the sharp bamboo stakes that Vietnamese folk hero and war general, Tran Hung Dao, planted in the bed of the Bach Dang River to impale Mongolian general Kublai Khan’s invasion fleet. Its the closest cave site to the mainland. Part of the same system, a nearby cave Hang Thien Cung has “cauliflower” limestone growths as well as stalactites and stalagmites.
Hang Sung Sot (Surprising Cave): is a popular cave to visit. It too has three vastand beautiful chambers, in the second of which there is an astonishing pink-lit “penis rock” (realy, its the only way to discribe it), which is regarded as a fertility symbol. It too requires a hike up steps to reach it, and a loop walk through the cool interior takes you back to the bay. Hang Bo Nau, another impressive cave can be visited nearby.
Hang Trong (Drum Grotto): is so named because when the wind blows through its many stalactites and stalagmites, visitors think they can hear the sound of distant drumbeats.