Los Angeles

How Green Is High-Speed Rail?

Experts say America's bullet trains will need to carry 10 million passengers to offset the environmental impact of construction

Do Doctors Avoid City Smog More Than Others?

In Los Angeles, at least, the answer is no

Where the Twitterati Live

Why the world's most popular tweeters are clustered in a handful of American cities—and Brazil

A Glimpse of Nature, Via Downtown Billboards

A photo project in Los Angeles and Philadelphia implants images of nature on urban billboards and buildings

What to Do With a Glut of Reusable Bags

One woman's quest to give away all the extra grocery bags she's collected

History Gives Hope to California High-Speed Rail

What America's first-generation railroad system says about its next one

Where the 1% Live

The richest Americans are gathered in a handful of metropolitan areas

The Best and Worst of the World's Central Plazas and Squares

A pair of slideshows illuminating what makes a public gathering space work and what doesn't

Designing for Density Doesn't Have to Be Ugly, or Scary

San Francisco-based architect David Baker finds beauty in buildings that house lots of people

Affordable Housing That Doesn't Scream 'Affordable'

Free from stigma and institutional homogeneity, these good looking buildings are in a class by themselves

U.S. Cities Face a Looming Bridge Crisis

18,000 bridges in need of repair are located in large U.S. metropolitan areas

Mapping Where Crimes Are Likely to Occur, Before They Happen

Santa Cruz is testing a new system that attempts to predict likely locations of future crimes

5 Great U.S. City Parking Apps

The next generation of parking technology does much more than just locate available spots

14 U.S. Infrastructure Projects Get Federal Fast-Tracking

Permitting and environmental review will be expedited, pushing for final approval within 18 months

L.A.'s Citywide Block Party

Sunday's 10-mile street closure in Los Angeles is a sign of progress in a city short on public space

The Best and Worst of Official City Flags

They're less visible, but most cities have flags just like countries or states. Some are great. Others, not so much.

Combating Obesity with Street Design

A new manual from L.A. County seeks to improve public health via the built environment

Great Neighborhoods, Streets, and Public Spaces for 2011

30 examples of great places in American cities from the American Planning Association

The Big Cities of a Child's Imagination

Recollections of what the wider urban world seemed like as a kid growing up in a small Southern city