The walls are built of sandstone rudely quarried at the rear of the church.

It is now the parish church of Monterey.
Here are a large number of interesting relics and memorials of Serra and the early Mission days.

The chief of these is a reliquary case, made by an Indian at San Carlos to hold certain valuable relics which Serra highly prized.

Some of these are bones from the Catacombs, and an Agnus Dei of wax.

Serra himself wrote the list of contents on a slip of paper, which is still intact on the back of the case.