What is an ossuary?

We do find ourselves in some intersting places! Ben, our operations Manager was installing some new radio microphones at St Leonards Church, Hythe in Kent and afterwards he visited the crypt where there are a huge number of skulls and other body parts which have been in the church since the middle ages.  The place where these are kept is know an an ‘ossuary’ https://en.wikipedia.org/wiki/Ossuary