Participants run the Great Wall Marathon at the Huangyaguan section of the Great Wall of China, in Jixian of Tianjin, China May 19, 2018. “It was very hard, it's my 25th marathon, my slowest and my most difficult one for sure, but amazing. I am glad I survived”, said Erin Skrettingland from the U.S. (Photo by Jason Lee/Reuters)
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