The term for bone houses is Ossuary or sometimes you see the Latin Ossuarium. The cemeteries were usually in the parish church yards and not very big because they were in the villages. Large separate cemeteries were not considered and therefore they soon ran out of space. The bones were removed and another person buried in that spot. Many a parish has a bone house where the bones are stored. I have seen some in which the persons bones are separated with one pile for skulls, one for arm bones, and one for leg bones. etc. So you ancestor might be scattered all over the room. An interesting one to visit is at the Catholic Church cemetery in Hallstadt Austria considered by some to be the oldest continually peopled town in Europe. Here, a separate stone building houses the bones which are separated as mentioned above. In some places the bones are kept in a special room in the church basement. Bill Kane