One of the best sites I have encountered is Find a Grave. From there, I have found headstone pictures, and also requested pictures from cemeteries listed there. There is a quite a large pool of volunteers out there willing to scour cemeteries for your ancestors. You can also volunteer to go to cemeteries yourself to survey them , list the people buried there and take photographs to post on their website. I have found this to be quite useful. Most times, the death certificate will list the cemetery and county in which someone is buried. On Find a Grave, you can search by name, cemetery, county or state. By name , it will list everyone with that last name. From there, you may find other ancestors you didn’t know existed!!