Waffle House started just outside of Atlanta, and you can still see that. In other big cities they seem to stay outside of the core - I suspect they don't want to have locations without parking. (But off the top of my head I can name two Atlanta-area Waffle Houses that don't have their own parking, namely the one right off Centennial Olympic Park and the one in downtown Decatur.)
Waffle House started just outside of Atlanta, and you can still see that. In other big cities they seem to stay outside of the core - I suspect they don't want to have locations without parking. (But off the top of my head I can name two Atlanta-area Waffle Houses that don't have their own parking, namely the one right off Centennial Olympic Park and the one in downtown Decatur.)