Click on title to access "missreadalot.gather.com/graveyards"
I have not checked it all out, but 369 photos are currently listed on this site that can be enlarged and viewed. They appear to have been posted by the same contributor and the tombstones are at cemeteries are in Ohio.
Don't be afraid to "go exploring" on Google for: Ohio, cemeteries, preservation, restoration, tombstones, gravestones, etc. etc. etc. - try different combinations, and you might be suprised at the results that might lead you to finding the tombstone of your long lost ancestor!!