The guide said that when you go down the mountain, take a breath, there is a lot of vegetation here, and the air is abnormally fresh. There are 120,000 negative oxygen ions per cubic centimeter. Someone once used bags to collect air for sale.
On 12/23, this day is a shame, because Zhangjiajie is in fog and rain for about 200 days a year. On the third day of our journey, we saw the mountains surrounded by clouds and fog, and the visibility was very low, so we did not see Tianmen Cave.
Tianmen Cave is a huge cave naturally formed in the main peak of Tianmen Mountain in the Tianmen Mountain National Forest Park in Zhangjiajie (source network on the left below). Tianmen Cave is the most representative scenic spot in Tianmen Mountain. It is located in the middle and upper part of Tianmen Mountain, with an altitude of 1300 meters, a gate height of 131.5 meters, a width of 57 meters, and a depth of 60 meters. It is the highest natural mountain cave in the world. And according to locals, the location of Tianmen Cave has changed. Seventy or eighty years ago, the orientation of the cave was not the direction we see today, which also filled Tianmen Cave with a mysterious color.