10. Diamond Arena

Architect: Atelier 11

Location: Beijing, China

With the world gearing up for an Olympic Games (London) and a European Championship (for soccer, hosted by Poland and Ukraine), stadium porn was a regular part of our architecture watch in 2011. The Diamond Arena opened officially on September 25, playing host to the China Open 2011. Designed by Atelier 11, the facility seats 15,000 and is fitted with the largest collapsible steel roof in Asia (it takes 12 minutes to open). Other notable features include a circular observation deck which allows visitors full view of the neighboring Olympic Park.