The Expo Axis is one of the world's largest membrane roofs. It spans the entrance and boulevard building of the World Exposition 2010 in Shanghai.

The combination of the membrane structure, which has a surface of 65,000 m2 in total with a span of 100 m, and the six steelglass funnels of 45 m height, formed of a freeform double-curved framework, constitutes the landmark of the Expo Shanghai 2010.

http://en.wikipedia.org/wiki/Expo_Axis

360-degree panorama photography by yunzeng liu