The world's largest game of pong, played on Philadelphia Cira Center's massive glass facade.
The estimates at this early stage vary widely.
The city conducted vivid, citywide disaster simulations in 2011 and 2012.
Mexico City's "Menos sal, más salud" encourages restaurant owners to make salt shakers available only for those who request them.
Race officials are reviewing security precautions with local police after the attacks in Boston Monday.
Apparent terror attacks at the finish line of the Boston Marathon.
And are they better or worse than the national average?
An artist reimagines the city's homes against the sky.
The system's expansion means plenty of jockeying to name the city's newest points of reference.
Watch the world grow.
A new site lets you turn any stretch of Streetviewed road into a hyperlapse, a timelapse with a mobile camera.
A user-generated global city comparator.
Do you like maps and death?
The "iceberg" metaphor made literal.
The stunning conclusion to the pedestrian streets vs. bike lanes nail-biter.
Meet the evangelists of cable-drawn aerial transportation.
How good things once were!