Introduction to Qimen Cave of Emperor Dragon Vein: Qimen Cave, commonly known as Cave Cave by locals, is located on a mountain 650 meters above sea level. The top of the mountain is Hongye Ridge with lush foliage. Qimen Cave is 38 meters long, 16 meters high and 4 meters wide. It runs through the mountain in the east-west direction and is known as the first cave in Jiangbei. Standing in the cave, the mountain wind is whistling by. Morning and night, you can see the light of the sun and the moon in the cave, and enjoy the most famous scenery of Qishan, "Qimen Sunset". According to legend, when Duke Huan of Qi Xiaobai was fighting for the throne with his son Jiu, he passed through this cave and took a shortcut back to the palace first, ascending to the throne and achieving hegemony. Qimen Cave got its name from this.