Found objects become an urban ping pong station in Helsinki.
Spray-painting walls in Beijing isn't actually all that dangerous. So why are there so few people doing it?
The population of a given metro area affects airline travelers more than you might think.
An oil boom has caused prices to soar in one small city.
Also, L.A. outlaws plastic bags; Lady Gaga ponders violent threats in Jakarta; and much more.
A Bronx private school uses the city to unite and apply the variety of subjects taught in class.
With thousands of vacant lots on hand, Philadelphia is trying to make it easier for people to buy them.
U.S. Navy Blue Angels soar above the World Trade Center as part of Fleet Week.
A Toronto photographer tracked the same addresses over four decades to tell his city's changing story.
Cities might not want to question the nation's people counters.
200 riders peddled from New York to Washington on the annual Climate Ride.
New Orleans wants to tax its tourist areas, but can't agree on how.
How does where we live affect our health? An expert tries to quantify it.
Researchers are already at work turning toasty asphalt into energy cities can actually use.
A team of "light painters" make jellyfish, birds and a whale appear in this dazzling video from Germany.
An interview with architect Christian Unverzagt of M1/DTW, who uses Detroit's history and resources to create better designs.
Designers in the Mexican city of León try to revive an ailing industry with furniture best described as "oil-slick chic."
Kenowa Hills parents have reacted strongly against a high school principal's decision to suspend 64 seniors for holding a "bike parade."
A city celebrates its first free election in 30 years.