The Spanish capital wants to impose some pretty drastic measures when air quality is especially bad.
#SaveNYC was inspired by a similar effort to help local businesses in London, but it also has detractors.
From driverless cars to safety initiatives, it was quite a year for advancements in mobility.
Ana Botella says demonstrations like the ones over the weekend are a detriment to the city's image.
Say hello to one of the creepiest pieces of public art in recent history.
Reconstructing the landscapes in amazing, large-scale detail.
New rules limiting busking have not gone over well at all with the city's struggling arts community.
The city's new master plan lays out a sharp turn back toward a pedestrian- and bike-friendly city.
The city's 6,000 cleaners have been on strike for more than a week. That's bad news for anyone who wants to walk outside.
Spain's capital is banning everything from dangerous rollerblading to jumping in a fountain.
Five percent of vehicles are responsible for 90 percent of toxic emissions. Now we can figure out who the culprits are.
A cheatsheet on which city might be chosen as the next future host of the Summer Olympics—Tokyo, Madrid, or Istanbul.
An unlikely mix of state pruning and raw commercialism is taking hold in Spain's capital.
Istanbul is everything the Olympic committee wants -- and everything it fears. Tokyo is boring. Really, there's only one choice.
Milan bans ice cream after midnight, Madrid bans noise. Has the continent lost its taste for fun?
Here's one way to activate public space at night.
It's not as crazy as it might sound.
North American cities are producing substantially less wealth per ton of greenhouse gas emissions than their European counterparts.