The Ossuary - externally the building offers much in the way of 16th century ecclesiastical architecture - including a series of 12 niches separated by fluted Doric columns between which statues of the 12 Apostles are mounted.
Above the pediment over the entrance door the inscription 1588 can be seen. There are two more Inscriptions :-
" Memento Mori -Remember that you have to die" and
"You, our children, who go past this place, remember that we departed this life".