Tourists walk out of the Palace Museum in Beijing, capital of China, May 1, 2013. Beijing received 4.97 million trips during the three-day Labor Day holidays, up 5.1 percent over the same period of last year, with tourism revenues rising by 10.6 percent year on year to 1.987 billion yuan (about 323 million US dollars), according to the Beijing Tourism Development Commission. [Xinhua]