An aerial photo taken on Sept. 1, 2017 shows the turtle-shaped Yongtai ancient city in Jingtai County, northwest China's Gansu Province. Located 25 kilometers of Jingtai County, Yongtai Turtle Town got its name because of the turtle-shape of the castle. As an ancient town dated back to the Ming Dynasty (1368-1644), the town was preserved as a national-level cultural relic. (Xinhua/Fan Peishen)