When we do structural investigations of old buildings, we find surprises. However, I have never seen anything like this. This was an old “shotgun” type house in West Atlanta that was being renovated. We went to the site to make structural recommendations. The house looked fairly normal at curbside, with the exception it had a granite foundation. Houses at that period were usually built on brick piers.
I went inside the basement, and now understand my field of view is limited by the flashlight beam. I was rather surprised to see stone walls in the basement. Then I noticed and opening in the wall. The mason put a very impressive arch over that opening. I stepped back and looked around. I was in an old stone house, which was probably built in the mid Nineteenth Centure. Generally you will not find anything built in Atlanta built before the Civil War.
Apparently, when this house was built, it was put on top of the existing stone house. I pointed this out in my report, but given that the house was being renovated by a developer, it is doubtful that any attempt was made to architecturally integrate the older house into the old house. Hopefully a future owner will do so.