Ah, so much for memory... Thanks for the reminder, and interesting observation.
When I go to the church I was baptised in over in Sweden, I see headstones from the 18th century. I always wonder who care for them, and the reason we choose to erect such memories of ourselves. It's also interesting to note that half of the people to ever walk the earth is alive today, thanks to the expansion in population in the last half century. Makes me wonder what cemeteries will look like in the future.