The cemetery contains an ossuary built in 1953; what is it used for?
The answer
Housed in underground galleries near the monument to the dead, this ossuary permanently holds the bones exhumed when plots are reclaimed, not only at Père-Lachaise but from sixteen other Parisian cemeteries.
This question belongs to the “Unusual Stories” series of the Père-Lachaise quiz: ten questions, a story behind every right answer.