A tourist visits the No.1 ice cave in Yunqiu Mountain in Xiangning County, north China's Shanxi Province, July 5, 2019. The widest point of the cave is about 12 meters and the tallest point is about 15 meters. Tourists can enjoy ice stalagmites, ice pillars and ice falls here. [Photo/Xinhua]

Photo taken on July 5, 2019 shows the inside of the No.1 ice cave in Yunqiu Mountain in Xiangning County, north China's Shanxi Province. The widest point of the cave is about 12 meters and the tallest point is about 15 meters. Tourists can enjoy ice stalagmites, ice pillars and ice falls here. [Photo/Xinhua]

Photo taken on July 5, 2019 shows the inside of the No.1 ice cave in Yunqiu Mountain in Xiangning County, north China's Shanxi Province. The widest point of the cave is about 12 meters and the tallest point is about 15 meters. Tourists can enjoy ice stalagmites, ice pillars and ice falls here. [Photo/Xinhua]

Tourists visit the No.1 ice cave in Yunqiu Mountain in Xiangning County, north China's Shanxi Province, July 5, 2019. The widest point of the cave is about 12 meters and the tallest point is about 15 meters. Tourists can enjoy ice stalagmites, ice pillars and ice falls here. [Photo/Xinhua]

Tourists visit the No.1 ice cave in Yunqiu Mountain in Xiangning County, north China's Shanxi Province, July 5, 2019. The widest point of the cave is about 12 meters and the tallest point is about 15 meters. Tourists can enjoy ice stalagmites, ice pillars and ice falls here. [Photo/Xinhua]

Photo taken on July 5, 2019 shows the inside of the No.1 ice cave in Yunqiu Mountain in Xiangning County, north China's Shanxi Province. The widest point of the cave is about 12 meters and the tallest point is about 15 meters. Tourists can enjoy ice stalagmites, ice pillars and ice falls here. [Photo/Xinhua]

Photo taken on July 5, 2019 shows the inside of the No.1 ice cave in Yunqiu Mountain in Xiangning County, north China's Shanxi Province. The widest point of the cave is about 12 meters and the tallest point is about 15 meters. Tourists can enjoy ice stalagmites, ice pillars and ice falls here. [Photo/Xinhua]

Photo taken on July 5, 2019 shows the inside of the No.1 ice cave in Yunqiu Mountain in Xiangning County, north China's Shanxi Province. The widest point of the cave is about 12 meters and the tallest point is about 15 meters. Tourists can enjoy ice stalagmites, ice pillars and ice falls here. [Photo/Xinhua]

Photo taken on July 5, 2019 shows the inside of the No.1 ice cave in Yunqiu Mountain in Xiangning County, north China's Shanxi Province. The widest point of the cave is about 12 meters and the tallest point is about 15 meters. Tourists can enjoy ice stalagmites, ice pillars and ice falls here. [Photo/Xinhua]