Introduction to the gate of Heilongtan: The gate of Heilongtan Scenic Area is the "Civilization Square". Built in the 16th year of Guangxu's reign, it was originally the gate of the Confucian Temple. There are eight-character screen walls on both sides of the front of the gate, and four carved stone lions from the Ming Dynasty in front. They are vivid in shape and exquisite in craftsmanship. The three characters "Black Dragon Pond" are hung on the top, and the words "Wenmingfang" are on the back.