Shanxi is endowed with an abundance of cultural sites from its long history. Most of the ancient structures were built before the Liao and Song Dynasties. So it is the reason why Shanxi is often called the 'Chinese Ancient Architecture Museum'. The more obvious of these include: the Buddhist wonder of the Yungang Grottoes in Datong City, the ancient city of Pingyao which was listed as a World Cultural Heritage site by UNESCO in 1997, the oldest and tallest ancient wooden pagoda in China, the Wooden Pagoda of Yingxian County and the remote Shuanglin and Jinci Temples, which are well worth the long journeys for the visitors. Of course, there are a number of natural magnificent and beautiful places that can also be seen in Shanxi. The most famous of them include Wutai Mountain with the longest and most prestigious history in the four most well-known Buddhist holy lands of China, the whistling rage of the Yellow River's Kettle Spout waterfalls (Hukou Waterfalls) and one of the Five Sacred Mountains in China - Mt Hengshan.