June 19, 2015, 12pm PDT
Developed using open data from local government sources, built: LA is a mapping tool that displays the age of every building in the county. Much of the area's built environment is surprisingly old.
December 14, 2010, 10am PST
Single-story, tiled-roof houses called hanok used to cover the footprint of Seoul, now a city of skyscrapers and avant-garde architecture. Today many describe the hanok as "endangered,"and conflict has come to a head in the small district of Bukchon.
The New York Times
April 5, 2009, 7am PDT
Isfahan is one of Iran's fastest growing cities. But it also has a distinct history -- one that is being threatened by the rapid pace of growth. Now, locals are trying to preserve the city's heritage.