In 1999, Seattle hired Rem Koolhaas, the Dutch architect, to design its new downtown public library, set to open early in 2004. Koolhaas produced a monolithic, mesh-covered, quasi-Mayan scheme worthy of any city's tourist brochure cover. Denver, Toronto, and Manchester gave post-Bilbao museum commissions to Daniel Libeskind, the now-famous winner of the Ground Zero competition, who delivered a trio of predictably dramatic and photogenic projects. His extension to the Denver Art Museum, shown here, looks like an explosion captured midboom, with sharply canted wings—faced in glass, titanium, and stone—shooting from the center of the building.