Tianmen Mountain Natural Scenic Area is located in Liukeqi Village, Shicheng Town, Miyun County, Beijing. The scenic spot is 4 kilometers long, covering an area of 3,000 mu, and more than 40 scenic spots. The main scenic spot "Tianmen" is also known as "Flat Danyan Eye", with an altitude of more than 800 meters, 60 meters high and 35 meters wide. It is said that Erlang Shendan Mountain is used to wear the flat dan eye when reclamating the sea. Erlang Shendan Mountain is halfway, and the flat dan eye is about to be open. It is put down the mountain. The flat dan eye in the south is in Zhangjiajie, Hunan, and the flat dan eye in the north is in Liukesi Village. The cave is embedded in the cliff, suddenly transparent like a city gate to the heavens, Tianmen Mountain is named because it is in the north, people call it "North Tianmen Mountain". It takes about two hours to climb to the top. You can overlook the Miyun Reservoir. If you are thirsty, you can buy water on the top of the mountain. It is not expensive. They are also sold on their backs. It is understandable to earn some hard money. The top of the mountain can take a small ring line, the southeast and northwest can be overlooked, down the mountain can choose another road, do not take the repeated route, the only highlight of this attraction is the distance to Miyun Reservoir, the rest is sloppy as an excuse for the attraction charge!