This aerial photo taken on May 4, 2019 shows people visiting a 518-meter-long glass-bottomed skywalk at Huaxi Adventure Park in Jiangyin in China’s eastern Jiangsu province, during a four-day national holiday marking May Day. (Photo by STR / AFP) / China OUTThis photo taken on May 4, 2019 shows people taking pictures on a 518-meter-long glass-bottomed skywalk at Huaxi Adventure Park in Jiangyin in China’s eastern Jiangsu province, during a four-day national holiday marking May Day. (Photo by STR / AFP) / China OUT