Fulton County
Located in southwest Atlanta, there is quite a large cemetery lost into a hill of a neighborhood. It’s been identified as the Dudley Cemetery. Based on old obituaries, it seems to have a tie to the Philadelphia Baptist Church due to the frequency of notices that indicated services at the church and burial at the cemetery.
From the base of cemetery, a dozen or so headstones can be seen. There are many depressions in the earth. I would guess over 100 burials are hidden in the hillside.
If you go, don’t trespass. It is privately owned land. I went with someone who knows one of the owners.