A woman cleans the stairs at a sinkhole-themed scenic spot in Fengjie County, Southwest China’s Chongqing Municipality, Sept. 13, 2016. As the only residents in Tiankeng, meaning giant sinkhole with vertical walls, the man and his wife have been living near the cliff for more than 20 years, working as sanitary workers and also looking after a hydropower station. (Photo: China News Service/Chen Chao)
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