A charnel house is a vault or building where human skeletal remains are stored. They are often built near churches for depositing bones that are unearthed while digging graves. The term can also be used more generally as a description of a place filled with death and destruction.
Contents of a Greek Orthodox charnel house showing disarticulated human skeletal remains
Charnel house of Amidadera temple (Nachikatsuura, Wakayama, Japan)
Charnel House at Saint Catherine's Monastery, Mount Sinai
Charnel house in Évora
An ossuary is a chest, box, building, well, or site made to serve as the final resting place of human skeletal remains. They are frequently used where burial space is scarce. A body is first buried in a temporary grave, then after some years the skeletal remains are removed and placed in an ossuary. The greatly reduced space taken up by an ossuary means that it is possible to store the remains of many more people in a single tomb than possible in coffins. The practice is sometimes known as grave recycling.
The limestone James Ossuary from the 1st century
Human remains on the walls and ceiling of Skull Chapel, Poland
A chandelier made of bones in Sedlec Ossuary, Czech Republic
Ossuary at the Gallipoli battlefield; contains the remains of French soldiers