Aside from locating cemetery and gravestones for relatives the old-fashioned way,
there have been a few new websites introduced over the past couple of years that
can short-cut your search. The main one is “Find-a-Grave.com” which you can search
online here. They currently have about 138 million records. Be advised though,
I have come across some records with very “dubious” data, stories, etc. Some have
photos attached, which helps greatly. Some also have hyperlinks to relatives buried
in the same grave / cemetery.