Sixty-four cities, 64 populations to rank by size.
Hitting urban rodents in their reproductive systems may be the best thing to ever happen to them.
This award-winning Dutch bike snaps together like one of those plastic airplane models that kids make.
Taking the bus makes people feel more social and less lonely, researchers say.
Rappers like to call out street names; New York artist Jay Shells likes to put their lyrics up at the actual intersections they mention.
The hotter neighborhoods of Raleigh are awash in scale insects, an ominous indicator of how bug populations might swell in a globally warmer world.
This latest gaping chasm is said to measure four-stories deep.
A modern dance from San Francisco.
This Ukranian urban climber is either extremely skilled or deranged (or perhaps both).
Arizona wants to tie bathroom access to birth certificates; scientists sound warning about pit latrines; a municipal government does BYO toilet paper.
An underpass with a forehead-level concrete ceiling seems designed to knock out Chinese citizens.
Can you imagine Pope Benedict XVI sorting through his wine cellar in this halo-shaped retirement home?
European researchers believe 14 percent of chronic childhood asthma can be blamed on living near busy roads.
A new app from Texas researchers shows how clouds of lung-pummeling ozone move through Houston neighborhoods.
You probably don't want to know.
Jeffrey Milstein has turned a lifelong fascination with airplanes into a gorgeous portrait series of jet hubs.
TrustoCorp totally had its way with the old Rock-a-Hoola water park in California's Mojave Dessert.
The nation's engineers surprise everyone with a slightly less dismal outlook on the state of our infrastructure.
If your hometown's been shot by astronaut/prolific shutterbug Chris Hadfield, it's probably viewable on this interactive map.