Tim Halbur

CNN's Richard Quest takes an incredulous look at the changes brewing in Los Angeles as downtown revitalizes and the city densifies.

Ben Brown reads Robert Putnam's new book, which explores the ways in which religion in the U.S. causes greater intolerance but simultaneously a greater civic engagement and likelihood of helping others through charitable acts.

A plan to underground the central train station of Stuttgart and create a new city neighborhood above it is so controversial that violent protests have broken out.

Leni Schwendinger says that cities don't pay enough attention to the way lighting effects the built environment. She's currently working on the lighting for Times Square's new pedestrianized streets.

Terra Vivos is a luxury community built entirely underground, and it can withstand a blast from a nearby 50-megaton nuclear bomb. Arnie Cooper takes a tour.