Architecture professor Diana Agrest evaluates her students' work during a class critique at Cooper Union in New York. LA Johnson/NPR hide caption

itoggle caption LA Johnson/NPR

The badly damaged Christchurch Cathedral is pictured on Sept. 7, 2011 during a tour given to foreign journalists visiting the city ahead of the rugby 2011 World Cup. England rugby manager Martin Johnson and several members of the playing squad visited the city to see the stadium and the city center which were damaged by an earthquake in February. Paul Ellis/AFP/Getty Images hide caption

itoggle caption Paul Ellis/AFP/Getty Images

Palm Springs houses like this represent classic midcentury modern style. Interest in the architecture, art and style of decades past is fueling Palm Springs' rising popularity among younger people. Keith Daly/Flickr hide caption

itoggle caption Keith Daly/Flickr

After World War II, developer Joseph Eichler built well-designed and well-crafted tract homes that dotted California suburbs. Stephen Schafer hide caption

itoggle caption Stephen Schafer

Karen Van Lengen and James Welty created a multimedia installation to encourage visitors to experience buildings like Grand Central Terminal not only through their eyes, but also their ears. Hansi Lo Wang/NPR hide caption

itoggle caption Hansi Lo Wang/NPR

Italian architect Renzo Piano talks to journalists in Paris in 2014. Eric Feferberg/AFP/Getty Images hide caption

itoggle caption Eric Feferberg/AFP/Getty Images

On the outskirts of Rome is a mile-long stretch of unfinished elevated track for a tramline. Work stopped in the mid-1990s. Under the guidance of Renzo Piano, architects are turning it into an elevated park. Courtesy of the G124 Group hide caption

itoggle caption Courtesy of the G124 Group

Jay Austin's tiny house in Washington, D.C., has 10-foot ceilings, a loft bed over the bathroom and a galley-style kitchen. Franklyn Cater/NPR hide caption

itoggle caption Franklyn Cater/NPR

Alfafar, a suburb of Valencia, Spain, is suffering from a poor economy and high unemployment. A quarter of homes are abandoned. Here, a cafe is still open on the ground floor of an abandoned municipal building in Alfafar's Orba neighborhood, but upper floors used to house shops. A pair of Spanish architects hopes to revitalize the high-density housing in this working-class area. Lauren Frayer/NPR hide caption

itoggle caption Lauren Frayer/NPR

Kathy Van Sluyters (left), Barbara Carr and Colleen Dickinson chat on a recently finished sidewalk across from Wildflower Terrace, a mixed-income apartment building in the Mueller development for people ages 55 and over. Julia Robinson for NPR hide caption

itoggle caption Julia Robinson for NPR

Solar Sunflowers, an art installation, greets visitors to Mueller's commercial and retail hub off of Interstate 35. The panels power a nightly light display and return power to the grid. When the development is complete, five miles of granite trails will connect the residents to its commercial and retail hubs. Julia Robinson for NPR hide caption

itoggle caption Julia Robinson for NPR

A resident of Lathrop Homes leaves one of the few occupied buildings in the development. The city wants to redevelop the public housing as mixed use, and offered vouchers to encourage residents to relocate. Cheryl Corley/NPR hide caption

itoggle caption Cheryl Corley/NPR

Icehotel is located 120 miles above the Arctic Circle. The temperature outside is well below zero, but inside the hotel — while still, of course, below freezing — it's much warmer, hovering in the low 20s. Ari Shapiro/NPR hide caption

itoggle caption Ari Shapiro/NPR