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Aerial photo taken on Oct. 11, 2018 shows relics of Heicheng, an ancient city built during China's Western Xia Dynasty (1038-1227), in Ejina Banner of Alashan, north China's Inner Mongolia Autonomous Region. (Xinhua/Liu Lei)
Aerial photo taken on Oct. 11, 2018 shows relics of Heicheng, an ancient city built during China's Western Xia Dynasty (1038-1227), in Ejina Banner of Alashan, north China's Inner Mongolia Autonomous Region. (Xinhua/Liu Lei)