Among the shops, restaurants, and venues of Atlanta’s affluent Buckhead section, there’s barely a hint of public green space—a problem compounded by what surrounds visitors: cars and interstates. Without an old elevated train trestle or similar out-of-use piece of infrastructure to convert into parkland, how do you solve the problem? The Buckhead Community Improvement District decided to take a halfmile stretch over the Georgia State Route 400 highway to create an elevated park from scratch.