Is Georgia’s capital — known for segregation and suburbanization — on the verge of a renaissance? Bike-loving architect Ryan Gravel wants to transform the 5.5-million-strong metropolitan area’s defunct railroad tracks with a 22-mile paved looped trail and light-rail trains lining its perimeter. The goal? To get folks out of their cars and onto the path. Some fear the $4.8-billion project, dubbed the Atlanta BeltLine, will lead to gentrification and a yuppie playland, while others hope it’ll rejuvenate city life.