Consider the population of the last several hundred years, particularly in urban areas, the number of existing cemeteries/gravestones, and the prevalence (or lack of) of cremation. Where the heck do you think all the bodies are? Under your feet, of course.
When my house was being redone by the developer, they sunk the existing basement and found 16 little (baby and toddler sized) coffins. 18th century. My neighbors think of my house as the dead baby house. Joke's on them. My dead babies are gone, they all still have theirs.
