Race officials are reviewing security precautions with local police after the attacks in Boston Monday.
More importantly: Does a city get anything out of the exercise?
A surprisingly large number involve cars.
You probably didn't even know that watercolor comes in 3D.
Universal mobility patterns we haven't fully understood before could soon come into view.
Taking the bus makes people feel more social and less lonely, researchers say.
London and New York continue to top the list of global financial centers.
London Cycling Campaign has a free design tip.
The intricate patterns of rail yards.
The Planners is partly bucolic escapism and partly a sidelong look at the state of Britain today. And yes, it's actually fascinating.
That's the idea, at least.
John Snow mapped out cases of cholera during an infamous 1854 outbreak in London.
Modern London was built on top of a large number of plague pits, and the city's thirst for more space means digging won't slow down any time soon.
Inside a beautiful new collection of "maps you shouldn't trust yet cannot help but fall for."
A new paper tracks suburbia from its ideological roots in the Victorian era to its harsh detractors in the modern age.
One-quarter of men surveyed also reported sitting down to pee so they could use their phones with both hands.
A visual reminder of where most pollution in our cities comes from.
One architect's vision for the Battersea Power Station in southwest London.
The arts have tended to ignore the Tube as a source of inspiration, but with the 150th anniversary of the system, we get 12 new books on its relevance.