It happens in New Orleans all the time. If it’s the same family it looks tasteful....not sure about different families....
Members are buried for one year in one of the mausoleum "drawers." After a year, the heat and humidity of New Orleans have done their job and the remains, now just bones, are deposited into the center shaft where all society members remains remain.
I could imagine a series of classical structures like this. . .
. . . fitting in quite nicely at Arlington.