Reuters

Income inequality in U.S. cities rivals that of many African cities, which struggle with deep divides between the haves and the have-nots, according to a recent report from the United Nations.

In Prague, where graffiti is rampant, an art gallery has secured outdoor wallspace throughout the city and invited graffiti artists to use it as a canvas for 12 days.

In an effort to dissuade jaywalking, police in Shanghai are planning to publish pictures and videos of jaywalkers in newspapers and local TV to shame offenders.

Despite improved air quality, China says it has no plans to continue the car control measures it has enacted during the Olympics to clean the city's air.

The only modern building in Rome's historic center, a Richard Meier designed museum, is considered offensive enough that it may not last in its current form.

As the economy continues to struggle, many expect governments to increasingly look at privatizing roads and other infrastructure.

Chicago's Loop is becoming a hot neighborhood.

Riders of the New York MTA hit the transit agency with $1.2 billion in injury and damaged property claims, seriously impacting the affordability of transit.

Air pollution is so bad in Mexico City that residents have less sensitivity to smells, according to a recent study.

The epidemic of vacant housing is leading not just to squatting, but to people illegally 'renting' out homes they don't own.

While Americans have not turned to the bicycle as a mode of transportation in the same numbers seen elsewhere in the world, some predict that soaring gas prices and increased infrastructure investments could change that.

With one of the world's higher rates of air pollution, Mexico City is cracking down on one type of emission: cigarette smoke. Smoking has been banned in all public places in the city, including office buildings and restaurants.

Capitalizing on the booming Mexican home market and government calls for better urban planning, Mexico's second biggest residential developer is planning six new towns complete with homes, stores, employment and schools.

New research suggests that urban sprawl doesn't cause weight gain in residents, though it does attract people who are inclined to be heavy and prefer to move around by car.

Miami may be the first American city to have its police force adopt Unmanned Aerial Vehicles (UAVs) to aid police in fighting crime, a development civil liberties groups are finding disconcerting.

The world's largest marine protected area has just been established around the tiny Pacific island of Kiribati.

Mexico City has announced plans to dedicate some of its transit system buses for use by women only -- a move made in response to increasing reports of women being groped on crowded buses.

As foreclosure rates rise across the country, former homeowners are seeking shelter in suburban "tent cities" while municipalities struggle to cope with extra costs and declining tax revenues.

The head of traffic and parking enforcement in Rome, Italy was fired after parking illegally using a fraudulent handicapped permit.

Officials in Spain have announced billion-dollars plans to help homeowners retrofit and renovate houses to be more energy efficient.