The BeltLine is a 22-mile route captured from abandoned train tracks to make a pedestrian corridor that encircles downtown. Long-range plans call for a light-rail streetcar to parallel the walking/cycling corridor.
On the left is the old rail corridor. Parallel is something under construction, except that the workers are taking a break. I assume the streetcar line will fit along here. This view is from the Park Drive Bridge into Piedmont Park.
On another note, here’s some architectural detail of the west façade of the Dockside building at the (south)west end of Lake Clara Meer in the park, with some blue, blue sky.