An aerial drone photo taken on April 30, 2024 shows a scenery of Hongshankou Great Wall in Xiaochang Township of Zunhua City, north China's Hebei Province. [Photo/Xinhua] An aerial drone photo taken on April 30, 2024 shows a scenery of Hongshankou Great Wall in Xiaochang Township of Zunhua City, north China's Hebei Province. [Photo/Xinhua] An aerial drone photo taken on April 30, 2024 shows a scenery of Hongshankou Great Wall in Xiaochang Township of Zunhua City, north China's Hebei Province. [Photo/Xinhua] An aerial drone photo taken on April 30, 2024 shows a scenery of Hongshankou Great Wall in Xiaochang Township of Zunhua City, north China's Hebei Province. [Photo/Xinhua] An aerial drone photo taken on April 30, 2024 shows a scenery of Hongshankou Great Wall in Xiaochang Township of Zunhua City, north China's Hebei Province. [Photo/Xinhua]