The temple, of neoclassical style, has a rectangular ground plan made up of a consistent central nave and various side chapels. The wide transept opens up on the left and gives way to a grandiose sacrarium. In the area of the presbytery one can visit fresco paintings with motifs referring to the Order of the Mercenaries and their founders. To be highlighted are the cupola of glazed tiles in two colours, blue and white, and the great coat of arms of the façade.