I know you said no to beaches, but St. Simons Island in GA is a great place to spend with your spouse for several days. Stay at the King and Prince (owned by the Sturdivant family). Many historic places there and nearby (Christ Church, Fredricksburg Colony, Sea Island, Jekyll Island) and great golf courses and seafood.
It may not be warn enough yet, but my wife and I enjoyed a little trip this year to South Dakota to see Mt. Rushmore and Crazy Horse, visited Sturgis, Deadwood, and then went on to Montana to see the Custer Battlefield. Three days not including travel there and great memories.
Spend a little more money and take her to Paris. You can fly direct from Atlanta on United or Delta. Take a day trip (using Viator) to Normandy OR to Giverny (Monet's home and gardens). See the Louvre and Musee d' Orsay. And enjoy the food. We never had a bad meal in Paris. My favorite restaurant is La Closerie d' Lilas on the Left Bank (Hemingway, Lenin, Picasso, Charlie Chaplin all hung out there).
Fredricksburg TX is a great place to visit and while there see Salado, N of Austin. Maybe you can catch the bluebonnets.
I see someone else posted Helen GA. I second that with Dahlonega added.
If you have enough time do a Rhine or Danube River small boat cruise.
Just GO and make memories.