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The St. Louis Art Museum addition is a humble box that draws its beauty from delicate details. It was designed by David Chipperfield. Photo by Alise O'Brien, provided by the St. Louis Art Museum. ( AE15FABUILDINGS )

The renovated Aspen Music School. That's Harry Teague Pavilion in the foreground,Scanlon Hall in the back. Photo by Alex Irvin. Provided by Aspen Music School. ( AE15FABUILDINGS )

The Aspen Music School renovation was designed by architect Harry Teague. The roof lines mirror the jagged mountains in the background, Photo by Alex Irvin. Provided by Aspen Music School. ( AE15FABUILDINGS )

The Aspen Music School renovation was a $60 million project. Photo by Alex Irvin. Provided by Aspen Music School. ( AE15FABUILDINGS )

The expansion at the Kimbell Art Museum in Fort Worth, Texas, cost $130 million. Photo by Joyce Marshall, Associated Press. ( AE15FABUILDINGS )

The Renzo Piano Pavilion, an addition to the Kimbell Art Museum, is the rare building actually named after its architect. Photo by Robert Polidori, provided by the Kimbell Art Museum. ( AE15FABUILDINGS )

The walls are concrete inside and out at the the Kimbell Art Museum in Fort Worth, Texas. The mixture, poured on-site, is 2 percent titanium to enhance its strength. Photo by ray Mark Rinaldi, Denver Post. ( AE15FABUILDINGS )

The roof of the Renzo Piano Pavilion slopes down to the ground, inviting pedestrian up to the city's newest public green space. Photo by Ray Mark Rinaldi, Denver Post ( AE15FABUILDINGS )

The Perez Art Museum connects to nature on its own terms with the vertical gardens along the exterior. Photo by Iwan Baan, provided by the Perez Art Museum. ( Pérez Art Museum Miami )

The new Perez Art Museum, on Biscayne Bay in Miami, is set on stilts to avoid flood dangers. Photo by Iwan Baan, provided by the Perez Art Museum. ( Pérez Art Museum Miami )

The Perez Art Museum at dusk. The building was designed by Herzog & de Meuron architects, based in Basel, Switzerland. Photo by Iwan Baan, provided by the Perez Art Museum. ( Pérez Art Museum Miami )

The Perez Art museum opened to the public Dec. 4, 2013, with an exhibit by Chinese artist Ai Weiwei Photo provided by the Perez Art Museum. ( AE15FABUILDINGS )

UPENN, Singh Center for Nanotechnology, Location: Philadelphia PA, Architect: Weiss/Manfredi Architects ( UPENN, Singh Center for Nanotechnology )

UPENN, Singh Center for Nanotechnology, Location: Philadelphia PA, Architect: Weiss/Manfredi Architects ( UPENN, Singh Center for Nanotechnology )

Orange, Orange. The Singh Center for Nanotechnology makes colorful statement with its interior: white, gray, black and bright oranges. Photo by Ray Mark Rinaldi, Denver Post. ( AE15FABUILDINGS )

The Singh Center for Nanotechnology is a new addition to the University of Pennsylvania campus in Philadelphia. Photo by Ray Mark Rinaldi, Denver Post. ( AE15FABUILDINGS )

The Krishna P. Singh Center for Nanotechnology features multiple glass walls throughout its interior and exterior. Photo by Daniel Tseng, Special to the Denver Post. ( AE15FABUILDINGS )

Windows at the St. Louis Art Museum expansion frame an outdoor sculpture by Andy Goldsworthy set in the courtyard between the new building and the old one. Photo by Ray Mark Rinaldi, Denver Post. ( AE15FABUILDINGS )

The ceiling of the Denver Art Museum is a concrete grid poured on site. The project cost $160 million. Photo by Ray Mark Rinaldi, Denver Post ( AE15FABUILDINGS )