New transit-oriented, mixed-use walkable downtowns, like this one in Rockville, Md., are often replacing indoor shopping malls and strip malls that once defined suburban America. Federal Realty Investment Trust/Courtesy of WDG Architecture hide caption

itoggle caption Federal Realty Investment Trust/Courtesy of WDG Architecture

Lenox Mall, in the Buckhead neighborhood of Atlanta, used to be the site of a country home estate and is now a traditional indoor mall with two anchor stores. Madeline Veira/Youth Radio hide caption

itoggle caption Madeline Veira/Youth Radio

Frankie Soto is in charge of the "underground" rock shows at an empty storefront in Stockton's Normandy Village Shopping Center. Brett Myers/Youth Radio hide caption

itoggle caption Brett Myers/Youth Radio