Cities Project Cities Project NPR's Series On Urban Life In The 21st Century

New York state is buying homes like this one in Staten Island's Fox Beach neighborhood as part of a Hurricane Sandy recovery project in the hopes that demolishing them will help nature return and provide a barrier to future storm surges. Matthew Schuerman/WNYC hide caption

itoggle caption Matthew Schuerman/WNYC

The Mathare Valley, shown here in an aerial map, is one of the largest and oldest slums in Nairobi, Kenya. Residents are using hand-held GPS devices to map the area, which comprises 13 villages and is home to nearly 200,000 people. Courtesy of Muungano Support Trust and Jason Corburn, UC Berkeley hide caption

itoggle caption Courtesy of Muungano Support Trust and Jason Corburn, UC Berkeley

Cable cars move commuters over a complex of shantytowns in Rio de Janeiro, one of many cities taking part in the smart city boom around the world. Felipe Dana/AP hide caption

itoggle caption Felipe Dana/AP

Miami Public Service Aide Tatayana Harris enters information into her laptop after clearing an accident in Miami's Little Havana community. Harris has been a Miami Police PSA for five years and hopes to become a police officer. Marsha Halper for NPR hide caption

itoggle caption Marsha Halper for NPR

Micaela Torres and 2-year-old Jakai Johnson swing underneath a surveillance camera at Miwok Park in Elk Grove, Calif. The city's police department collects more than 100 video feeds from across the city. Steve Henn/NPR hide caption

itoggle caption Steve Henn/NPR

Residents of the Estonian capital of Tallinn can use public transportation for free after purchasing a special card for 2 euros. Raigo Pajula/AFP/Getty Images hide caption

itoggle caption Raigo Pajula/AFP/Getty Images

The Spanish city of Santander is using a network of sensors to help improve services and save money. Incidents reported to Santander's command-and-control center, where the city manages data from sensors and smartphone reports made by citizens, are plotted on a map of the city. Courtesy of the University of Cantabria hide caption

itoggle caption Courtesy of the University of Cantabria

Rio's Operations Center brings together more than 30 agencies and allows them to coordinate on daily issues such as traffic, as well as on emergencies such as the frequent flash floods in hillside slums. Raphael Lima/Courtesy of the Operations Center, City of Rio De Janeiro hide caption

itoggle caption Raphael Lima/Courtesy of the Operations Center, City of Rio De Janeiro

Information, like light, flows through cities in interesting, often beautiful, patterns. Valery Hache/AFP/Getty Images hide caption

itoggle caption Valery Hache/AFP/Getty Images