China improves Great Wall protection

Undated photo shows cloud and fog at Huangyaguan section of the Great Wall in the Jizhou District of Tianjin, north China. China's National Cultural Heritage Administration has vowed to strengthen the protection of the Great Wall, which is more than 21,000 km long. The Great Wall, a UNESCO World Heritage Site, consists of many interconnected walls, some dating back 2,000 years. (Xinhua)