In between: Suntrust Park and The Big Chicken (both in Cobb County/north of the perimeter)
Downtown: Skyview, Sweet Auburn Market, Georgia Aquarium, Centennial Olympic Park, World of Coke, Center for Civil and Human Rights, and (of course!) the W Atlanta Downtown. Map of "downtown"
O4W/L5P: These stand for "Old Fourth Ward" and "Little 5 Points", which are east of downtown, respectively. Jackson Street Bridge (best photo of Atlanta!), Ponce City Market, Martin Luther King Jr. National Historic Site, The Beltline, The Carter Center, Little 5 Points/The Vortex.
In between: Lenox Mall, as represented by a cupcake because of their cupcake ATM machine! (no joke)
Grant Park: Love Lock Bridge, Zoo Atlanta, Oakland Cemetery, Krog Street Tunnel and Murals, Grant Park, and more trees!