Cemetery, New Orleans style.

You can't bury the dead very well in the wet parts of Louisiana. When the floods come along, the caskets tend to be somewhat buoyant, and do their best to surface and float off the cemetery proper. Drilling holes in the caskets didn't help. Putting up wrought-iron fences kept the caskets from floating away, but it was still something of a mess. The above-ground mini-mausoleum was an idea from the Spanish period of New Orleans; you house one or two caskets in the upper portion, and let 'em sit for a year and a day. At the end of that time, due to the heat, they're just bones, so you put the bones in a nice sack of some kind and put them in the lower chamber, with several hundred of their closest deceased ancestors. Saves on space something fierce. Some say that the business about floating away is just folklore, and that style has just as much (if not more) to do with it, but that's not as good of a story.