Piotr Lobodzinski of Poland celebrates after winning the men's category during the Lotte World Tower International Skyrun 2018 in Seoul, South Korea, on May 13, 2018. Runners raced up the 123-floor, 2,917-step, 555-meter-high skyscraper, South Korea's tallest of the kind, on Sunday. (Xinhua/Wang Jingqiang)