Introduction to Jiaoshan: Jiaoshan is located 3 kilometers north of Shanhaiguan City. It is the highest peak of the northern mountain barrier of Guancheng, with an altitude of 519 meters. Its peak is flat and can seat hundreds of people. It has huge boulders and looks like a dragon head with horns. The main attractions include Jiaoshan Great Wall, Enemy Tower, Jiaoshan Temple, and Ruilian Holding the Sun. In 1961, it was established as one of the first batch of national key cultural relics protection units. Jiaoshan is the first mountain that the Great Wall stretches across from the eastern sea to the north, so it is also known as "the first mountain on the Great Wall".