Alek Miller

Vegas' CityCenter, designed by a handful of notable architects, may be Vegas' first walkable, urban development, complete with LEED Gold Certification.

In another unsurprising study, California's roads and highways are ranked nearly last, and said to be the worst in urban areas.

Because of the abundance of social interaction and diverse clientele, subways have long been the sites of sociological experiments to understand human behavior.

Volunteer electricians from the Soweto Electricity Crisis Committee reconnect those who can't afford to pay the bill.

This Colorado city and four others across the nation have made early moves toward sustainability, innovation, and clean technology.