Introduction to the Cultural Corridor: Longmen Tianguan was an important pass from Kyoto to the outside of the Great Wall in history. It has left behind a large number of cultural buildings and cliff carvings, including Dalongmen Castle, Inner Great Wall, Ersheng Temple, Dalongmen Ancient Village, Ape Man Valley, Shangtiangou and Longmen Canyon are praised as the largest historical and cultural corridor in North China.