Introduction to the ruins of the Qi Great Wall: The old dragon head of the Qi Great Wall is located at the intersection of Jiangshan Road and Qi Great Wall Road. It is one of the only "two old dragon heads of the ancient Great Wall" remaining in China's coastal areas so far, and can be called a "natural national treasure" . As early as more than 2,500 years ago, this "China's oldest Great Wall" built by the Qi State during the Spring and Autumn and Warring States Periods stretches 309 kilometers from Changqing County, Shandong Province in the west to Yujiahe Village in Huangdao on the coast of the Yellow Sea in the east. The old leader of the Great Wall of Qi, the Beacon Tower of the Great Wall of Qi, is located on the seashore northeast of Yujiahe Village, Huangdao District. The Great Wall of Qi is composed of three parts: the square beacon tower, the beacon tower passage and the beacon tower passage wall. It constitutes a castle fortress on the ancient coastal defense border.