I've just been having a conversation with DH and it has made me think of something I can't find out about.
In graveyards I have seen gravestones for people who died in the 1880's. It would be amazing to think they are still being tended by a relative but I expect extremely rare. Given thousands of people are buried every year where do they all go? If authorities can't get in touch with the persons family who died in 1880, and where there is room in the plot, is the stone removed and then someone unrelated buried there? Space has to be a factor. DH and I are going to be cremated but I'm sure many thousands of people still want to be buried.
If there is a better topic please let me know, I did look through them all but nothing obvious came to mind.