Shortly after Monday's bombings, cellular networks collapsed. The same thing happens every time there is a crisis in a large city.
If climate change caused the waters to rise by 500 feet, this is what major international cities might look like.
A new report zooms in on how people actually want to use the subway, giving rise to a hypothetical train design for the future.
Done right, they might enable "meaningful social interaction" between a neighborhood's new arrivals and its existing residents.
If one were to somehow take a mental-health reading of commuters at 6:30 p.m. on a Monday, it would look something like this "Frustration Index."
Why do retailers, restaurants and grocery stores stay out of communities that can afford (and want) them?
Julian Marshall explains why he wanted to make a film about the "Obey Giant" street-art campaign.
Mexico City's "Menos sal, más salud" encourages restaurant owners to make salt shakers available only for those who request them.
The bombings have turned all the cues and surroundings of this time of year upside down.
The city of Boston is blanketed with security cameras. But finding the right shots is a little like looking for a needle in a hay stack.
Participants in the 2013 Boston Marathon hailed from across the globe.
"We thought in this moment it was important show solidarity as caring human beings."
Rather than improving police accountability, the city inexplicably took away an important source of transportation.
Early reports suggest at least one of the bombs used in yesterday's Boston Marathon attack was hidden in a garbage can. There's a case to be made for removing them all.
A documentary details the story of Annie "Londonderry" Kopchovsky, who rode around the world on two wheels in 15 months.
The Chinese capital estimates 10 percent of its population lives in tiny, below-ground apartments. Are they crazy or clever?
Locals on social media report a distinct lack of chaos, "just a feeling that everyone is focused."
New York, Los Angeles, and Washington, D.C. have stepped up police presence on transit, at tourist attractions, and near hotels.
There are reasons why places like Boston have tended to think of themselves as relatively safe compared to say, New Orleans.