North American cities are producing substantially less wealth per ton of greenhouse gas emissions than their European counterparts.
At least, that's not what's going on in this widely circulated photo of a sinkhole filled with bright green ooze.
Welcome to your demographic future, Charlotte, North Carolina.
He had visited the Market Street demolition site several times in the last few months and had declared it safe.
A partially demolished building fell onto a Salvation Army thrift store, trapping more than a dozen people inside.
A peek at the archdiocese's unprecedented push to bring back its struggling schools.
A four-story structure undergoing demolition collapsed onto a thrift store in Center City this morning.
Where's the dang swarm, already?
People have seen bugs belonging to Brood II, aka the mega-prolific 17-year cicada, from Georgia up to New York.
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.