Dujiangyan is the oldest and only surviving no-dam irrigation system in the world; and a wonder in the development of Chinese science. The project consists of three important parts, namely Yuzui, Feishayan and Baopingkou scientifically designed to automatically control the water flow of the rivers from the mountains to the plains throughout the year. Mt. Qingcheng is one of the most famous Taoist mountains in China. It is also a very attractive and intriguing scenic spot that is covered by luxuriant and verdant trees. The mountain, which is surrounded by numerous peaks and is shaped like a city, is dubbed 'the most peaceful and secluded mountain under heaven' and combines perfectly with its evergreen scenery. Price above are valid excluding the periods of Chinese New Year, May day holiday, China National Day holiday and other important activities which cause the big tour price change, an enquiry would be necessary for the exact tour price if you happen to travel during these periods.