Not much, according to one urban hactivist, as long as you've got some white tape and shopping carts.
Photos of the Monaco Grand Prix, a race that turned the city's streets into a driver's playground.
America has more than 5,000 prisons. This is what they look like on our landscape.
Wartime cartography shows how U.S. bombing of Japan shifted from military targets to cities in general.
Once seen as a civic gem, demand for a permanently enclosed stadium has dwindled.
Batman: Death By Design, explores the link between Batman and architecture.
A Toronto photographer tracked the same addresses over four decades to tell his city's changing story.
An interview with architect Christian Unverzagt of M1/DTW, who uses Detroit's history and resources to create better designs.
Amazing pictures of an artist's handcrafted city.
The Skytree debuts in Tokyo.
A new bike club in China makes creative use of its roof.
A two-block virtual walk highlights Copenhagen's exceptional urban atmosphere.
After many setbacks, Rem Koolhaas's "reinvention of the skyscraper" is nearly ready to open.
Scenes from a highway reclaimed by the city's pedestrians and cyclists.
At a new festival in Rotterdam, the world's most fragile and temporary pavilion.
A sociologist and an urban historian document the community activism reshaping some of the cities hardest hit by the great recession.
Has the city's public-works department gone rogue?
A photographer documents the way residents of Amman, Jordan, get around.
Who doesn't want to enjoy some alone time in a shiny polyhedron from outer space?