The world's largest game of pong, played on Philadelphia Cira Center's massive glass facade.
As school districts downsize, they leave behind shuttered buildings. Finding new uses for them can be difficult, to say the least.
The cities that lead America's transition from a goods-producing to service economy.
The federal government has prepared a short list that includes 220 mph trains.
The Pennsylvania Railroad isn't coming through that tunnel — so how come we keep going through its doors?
Linguists are still trying to understand the surprising evolution of how Philadelphians speak.
The ninth in our series exploring the class divides across America's largest cities and metros.
Planters cover up offensive projects.
The $9 million Bloomberg Philanthropies contest also awards innovations from Chicago, Houston, Philadelphia and Santa Monica.
From Snowpocalypse to Snowquester.
Publicly owned Internet infrastructure is luring jobs to smaller towns. Should big cities follow their lead?
Five winners will be announced this spring, but these ideas stand out above the rest.
This is what happens when a city releases its data.
Our weekly roundup of the most intriguing articles about cities and urbanism we've come across in the past seven days.
Skaters fight for their rights in a Philadelphia park designed by modernists.
New research shows a startling prevalence of the disease among children younger than 5.
Climate change-related heat waves and intense storms are projected to hit Eastern U.S. cities especially hard.
Our annual look at the extensive information now available from city governments, and the tools people are building with it.