Tianmen Mountain National Scenic Area is located at Liu-ke Valley, Shicheng Town of Miyun in Beijing. The main scene there, “Hole on Heaven Gate” (also known as "shoulder pole eyes"), is more than 800 meters, about 60 meters high and 40 meters wide. It is said to be hole used by a God named Er lang Shen to thread his shoulder pole when he shouldered mountains to fill seas, and is the biggest west-to-east-through vertical mountain cave that have ever discovered in North China. This Yanshan Mountain located scenic spot has a variety of plant and animal species with flourishing natural vegetation and abundant wild fruits. The forest coverage rate there is as high as 95%. There are also more than 1,000 different types of herb species, and thus makes it a rare science and education base and ecological tourism scenic spot. The strange peaks and odd stones inside the spot stand like a forest, and the “Cockscomb Peak”, “Gorilla stone”, ”Portrait Cliff ” and “Sphinx” are remarkably true to life. The big brick bed in the stone house, the stone roller, the millstone, and the simple folkways, the peasant meals, the fruit picking, are all reluctant for you to leave.