An interior view of the Bird's Nest

Workers clean the seats inside China's National Stadium, also known as the "Bird's Nest", Feb. 17, 2008. Constructions of the 91,000-seat arenas, the venue to hold the opening and closing ceremonies for the coming Olympics, near completion as the 80,000 unmovable seats have been installed by the end of January. [Xinhua]

Source: China Daily