Completed in 1574, this is a combination church and fortress, the only one of its kind in the country. This impressive whitewashed building honors the saint of the military. The capital crowning the baroque building is ridiculously tiny for such a structure, and its towers are of different height and design, a curious hodgepodge. Two of its three arches were reconstructed without windows, the third framing a massively sturdy door. This architecture followed in the wake of attacks by Sir Francis Drake's men but might also have been to protect the building against hurricanes. There is little of interest inside, so you may be in and out the door in 10 minutes or so.