Huifengzhai ancient stronghold in NW China's Shaanxi

Aerial photo taken on Dec. 15, 2020 shows a view of the Huifengzhai ancient stronghold on top of a loess ridge in the Yanchuan Yellow River Shequ National Geological Park in Yanchuan County, northwest China's Shaanxi Province.(Xinhua/Tao Ming)

YAN'AN, Dec. 16 (Xinhua) -- Located inside the Yanchuan Yellow River Shequ National Geological Park, the Huifengzhai ancient stronghold faces the Yellow River in the east and are surrounded by steep cliff. Built during the 16th century, the once military fortification has turned into a tourist attraction in northwest China's Shaanxi.

Aerial photo taken on Dec. 15, 2020 shows a view of the Huifengzhai ancient stronghold on top of a loess ridge in the Yanchuan Yellow River Shequ National Geological Park in Yanchuan County, northwest China's Shaanxi Province. (Xinhua/Tao Ming)

Aerial photo taken on Dec. 15, 2020 shows a view of the Huifengzhai ancient stronghold on top of a loess ridge in the Yanchuan Yellow River Shequ National Geological Park in Yanchuan County, northwest China's Shaanxi Province. (Xinhua/Tao Ming)

Aerial photo taken on Dec. 15, 2020 shows a view of the Huifengzhai ancient stronghold on top of a loess ridge in the Yanchuan Yellow River Shequ National Geological Park in Yanchuan County, northwest China's Shaanxi Province. (Xinhua/Tao Ming)

Aerial photo taken on Dec. 15, 2020 shows a view of the Huifengzhai ancient stronghold on top of a loess ridge in the Yanchuan Yellow River Shequ National Geological Park in Yanchuan County, northwest China's Shaanxi Province.(Xinhua/Tao Ming)

Aerial photo taken on Dec. 15, 2020 shows a view of the Huifengzhai ancient stronghold on top of a loess ridge in the Yanchuan Yellow River Shequ National Geological Park in Yanchuan County, northwest China's Shaanxi Province. (Xinhua/Tao Ming)

Aerial photo taken on Dec. 15, 2020 shows a view of the Huifengzhai ancient stronghold on top of a loess ridge in the Yanchuan Yellow River Shequ National Geological Park in Yanchuan County, northwest China's Shaanxi Province.(Xinhua/Tao Ming)

Aerial photo taken on Dec. 15, 2020 shows a view of the Huifengzhai ancient stronghold on top of a loess ridge in the Yanchuan Yellow River Shequ National Geological Park in Yanchuan County, northwest China's Shaanxi Province. (Xinhua/Tao Ming)