No. 5. Firm: Richard Meier & Partners Architects. Site: Bergamo, Italy. Idea: The iLab headquarters for Italcementi, one of the top concrete manufacturers in the world, is rocksolid but startlingly airy, too. The 250,000-square-foot building is constructed with a high strength, low maintenance reinforced concrete that Italcementi developed specifically for it. Photo: Scott Frances/Otto. From "100 Big Ideas".