I think the term ossuary somewhat flatters what we see here in the São Francisco Catacombs in Porto. This is more of a bone pit which looks like it has been cremated at least once.
This is where many of the hoi-polloi of Porto were interred, unlike their wealthier neighbours who had family tombs. This rather macabre scene can be viewed through a grill in the floor in the catacombs - it is something of a contrast to the sumptuous gold-gilded interior of São Francisco church next door.
