I love the Auburn-Opelika area, but how the heck did Opelika end up the capital?
In my maps, Opelika is one of my go-to choices for a southern capital. It's on the Alabama/Georgia line dividing east and west, so you can make a federal district easily.
Though I suppose you can say the same about many cities: Savannah, Vicksburg, Texarkana... (Or for the north... Youngstown, Richmond [Indiana], Terre Haute, any of the Quad Cities.)
...Now I kinda want to make a map with dueling Richmond capitols.