Introduction to Neptune Hall: Two palace lanterns hang in the center of Neptune Hall, making the cave brightly lit. This palace lantern was grown from stalactites dripping with water. It is now 1.8 meters in length. Calculated by one centimeter every 30 to 50 years, it has grown for more than 9,000 years. There are countless large and small stalactites on it, which are very gorgeous like lanterns and festoons. The scene where Yang Zirong knocks out two lanterns with one shot in the movie "Taking Tiger Mountain by Wisdom" and the main scene of the TV series "Eight Immortals Celebrating the Lantern Festival" were both shot here.