Yesterday morning I stumbled across this site for North Dakota -
https://northdakotagravestones.org/ once there if one picks cemeteries it will show all the counties in the state.
Picking a county of choice - one can see what cemeteries they have photos of by cemetery. For North Dakota they have nearly 39,000 tombstone photos from across the state.
This site was created by an Iowa CC in 2003 with the help of his son who was a programmer.
What I like about it versus Find-A-Grave is that it is much easier to see all the cemeteries listed for the county that they have photos for. I know that can be done on Find-A-Grave but it is not as easy as this site.
For other state projects for this project - at the bottom of the page click on GPP Projects to see the list there. Only 39 states are listed, with New Jersey only having Civil War vets at the present time.