Introduction to the Great Wall of Qi: The Great Wall of Qi rises from the east mountain of the Great Wall, lying like a long dragon on the north mountain of the Wolong Valley Grand Canyon. It stretches like a flat river on the top of the north, and five miles to the east is the Nail Head Cliff. Nail Head Cliff is extremely precipitous. It is said that when the Great Wall of Qi was built here, a supervisor said it was too dangerous and difficult to build. Shangfeng was furious and cut off his head and nailed it to a cliff for the crime of weakening the morale of the army. Later, because the place was too dangerous to climb, the Great Wall of Qi was not built for 20 miles eastward, but was replaced by danger.