Beijing National Stadium through “fish-eye lens”. (China.org/Zheng Liang)

Beijing National Stadium, also known as the Bird's Nest, was designed as the main stadium of 2008 Beijing Olympics Games. Now, it's a centre of international and domestic sports competitions and recreation activities of China.

Beijing National Stadium is also the main stadium of the 2015 International Association of Athletics Federations (IAAF). There are about 2,000 athletes from 207 countries to play together. Chinese sports delegation is composed of 32 male athletes and 38 female athletes, who will take part in the 34 matches in all of the 47 events.