And it moves to reflect the real position of the sun.
Just think of the traffic.
Cities are experimenting with different materials — from heated panels to flexible rubber — but the best replacement has yet to emerge.
Where the biggest demographic shifts are happening along the city's Green line, the buildings are changing with them.
Law enforcement plays the determining role in where and when sex workers make a living in the United States.
A start-up called Urban Engines believes data analysis and commuter lotteries can help cities reduce congestion.
In D.C., federal funding to renovate or maintain existing affordable housing units has been cut virtually in half.
Three years and $15 million later, the restored monument will be ready for visitors again this afternoon.
A 100,000-square-foot facility in D.C.'s Anacostia will produce 1 million pounds of produce a year and provide up to 25 permanent jobs.
A photo exhibit of Dan Kiley's prolific career.
The eastern part, anyway; in the West it will be hotter and drier, predict scientists.
Mapping where homes are out of reach for the median family.
Walkable suburbs and center city companies are dominating the tech scene.
Cities trying to boost ridership have a few options, but lots of room for improvement.
Frigid parts of the U.S. are warming up for a couple days, but don't get comfortable yet.
I-95 south of the nation's capital has some of the worst traffic in the country. Next year, you'll be able to buy your way out of it.
Cops want to get paid, too.
Very few people in Boston are uninsured, but there are huge swathes of them all over Dallas.
Pimps in Atlanta take in more than $30k per week, but only 14 percent reported spending some of it on condoms, according to a massive new report from the Urban Institute.