An aerial photo shows the snow-clad walls and moat of the Ancient City of Pingyao in Pingyao county, Shanxi province, on Jan 5. The Ancient City of Pingyao is a well-preserved example of a traditional Chinese City, which became a UNESCO World Heritage Site in 1997. [Photo/Xinhua]

Visitors walk in the snow-covered Ancient City of Pingyao in Pingyao county, Shanxi province, on Jan 5. [Photo/Xinhua]