Tourists visit the Huanglong Cave scenic area in Zhangjiajie, central China's Hunan Province, Dec. 17, 2016. The tourism in Zhangjiajie City is improved while the local environment is well preserved. (Photo: Xinhua/Wu Yongbing)
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Tourists visit the Huanglong Cave scenic area in Zhangjiajie, central China's Hunan Province, Dec. 17, 2016. The tourism in Zhangjiajie City is improved while the local environment is well preserved. (Photo: Xinhua/Wu Yongbing)
