Participants stand on the roof of a skyscraper as they take photos of high-rise buildings in Chongqing, southwest China, June 18, 2018. Local residents in Chongqing were invited to take part in a public photography activity held on Monday to capture the city's urban beauty with their cameras and smartphones. As part of the 2018 Chongqing International Image Festival, the event also attracted some 2,000 professional photographers and photo enthusiasts nationwide. (Xinhua/Liu Chan)