Open this photo in gallery: People visit a market with barbecue restaurants on May 2, during the five-day Labour Day holiday, in Zibo, in China's eastern Shandong province. In March, the small city received 4.8 million visitors.STR/AFP/Getty Images Fame has been both a blessing and a burden for Zibo. Home to about 4.7 million people, the city in China’s eastern Shandong province was once best known, if it was known at all, as a manufacturing hub, close to the port of Qingdao, on the Yellow Sea. After work, many locals would grab a snack – scallion pancakes and meat skewers...