In strongly Catholic Brittany, the remains after a few decades (by that time reduced to bones), were moved to ossuaries, typically in underground tunnels in the churchyard or beneath auxiliary buildings in the church complex. There they were sometimes sorted into skulls, long bones, etc, in fancy patterns for display. There seemed to be no need to keep them together as individuals...  
(Caution -- actual pictures of the remains)   https://www.youtube.com/watch?v=DVDdWIDUrRU