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by orpheline 2522 days ago
Medieval Christian cemeteries often overfilled, especially if the cemetery was thought especially holy. Demand was so high in some places graves were regularly reused: the bones were exhumed and stacked wherever they would fit.

For a spectacular answer to the "What do we do with all these bones?" question, check out the ossuary at Sedlec in the Czech republic:

https://en.wikipedia.org/wiki/Sedlec_Ossuary?wprov=sfla1