If there is one thing I love about this city besides the food is the various murals and Graffiti you are sure to see on the streets. Krog Street Tunnel is probably one of my favorites where you can see a bunch of art in one area.
If you've ever been to Sister Louisa's aka "Church", you would notice a small parking lot across the street. Every so often the piece of art would be changed. This one is in honor of "Spiderman Homecoming".
Check out https://www.yelp.com/biz/krog-street-tunnel-atlanta-2 to view previous artwork in the tunnel.