Hi: I had the same experience a few years ago, when doing research on one branch of my KELLY family in Baltimore, MD. At New Cathedral Cemetery, they told me that you could request an "extra deep" grave, so that someone else could be buried on top, but they would not open the grave for 25 years, to insure that nothing would be left from the original burial. At Holy Cross Cemetery, now part of Woodlawn Cemetery, my grandparents were buried two deep as far back as 1907. I am told that the plots were sold that way - for the purpose of stacked burial. When my grandmother KELLY died and they dug the grave, they found that my grandfather's body had been preserved - it looked like a statue, and there was no sign of the casket - it had disintegrated! Mary Jean