The 2008 Beijing Olympic Opening Ceremony was held at the National Stadium, also known as the Bird's Nest, located in Beijing's Olympic Green. The stadium, designed by Herzog & de Meuron Design Office and China Architecture Design & Research Group, seats 91,000 people and used 45,000 tons of steel in its framework. It features a 20 meter diameter elevating platform that can rise 11.4 meters high to serve as a stage for the ceremony.