The attractions that follow the red and green line, with the explanation, feel quite worth seeing. This underground city was used for refuge during the ancient war. It extends in all directions to rugged and rugged. Most places can only allow one person to pass. You can be a husband and a husband. It is very suitable for the enemy. There are 8 floors in it, and the facilities are all available. When we went, the explanation always emphasized that we should not look comfortable or not, because this is originally for war, and the important thing is to live. [Facilities] There are kitchens and living rooms in the kitchen, as well as special wine cellar churches, etc., which can accommodate many people to live in, although it is a small society. When I entered, some roads were more difficult to walk, but it felt worth seeing, a bit of Chinese authentic warfare.