Photo taken on Feb. 5, 2016 shows the snow scenery of the Jiayuguan section of the Great Wall in Jiayuguan City, northwest China's Gansu Province. 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/Shi Yonghong)