A team shows off its invention, which would make underground parks possible.
"Sentiment analysis" of social media could change the way you report potholes forever.
Three of the finalists in this week's startup contest offer city-themed innovations.
The city's population is expected to mushroom to 9.1 million by 2030. Here's a novel way to accommodate that growth.
The original Twin Towers had trouble finding tenants, but the new buildings are off to a promising start.
Is this still a good idea?
It's been more than two years since Columbia University professor Kate Orff made waves with her "Oyster-tecture" proposal. She's still pushing.
Private moments at public gatherings in New York and Washington.
Long-time city photographer Steven Siegel recalls one of his favorite subjects, the World Trade Center.
Large, expensive U.S. metros were more likely to lose residents this summer.
One couple's quest to find serenity in "the wilderness" of Staten Island.
The most and least dense U.S. metros for business enterprise.
A different kind of subway art.
A proposal to make Market East Station the city's new Northeast Corridor rail hub could change everything for that district.
The Financial District is one of the angriest places in Manhattan, according to software that measures emotion.
The places with a disproportionate impact on what gets made, admired, and sold.
Are cities creating new species of animals?
What makes some spaces better than others?
The Bike Crash Kit for the iPhone contains all the things you need after getting run over by a car.