China has completed the stadium, known as the Bird's Nest, for the 2008 Beijing Summer Olympics.
The Bird's Nest can hold 91,000 spectators, and is made of approximately 22 miles of unwrapped steel, weighing 42,000 tons, that has been welded into a crisscross shape to resemble twigs in a bird's nest.
It measures approximately 1,052 ft. long by 731 ft. wide by 226 ft. high.
It was designed by the Swiss architectural firm Herzog & de Meuron with the assistance of Ai Weiwei, one of China's leading modern artists.
The cost was around $500M.