Two chapels are furnished with simulacra, including a wooden niche. As the only example in Iglesias of Counter-Reformation architecture, the predominant feature of this church is the correspondence between its interior and exterior. The facade has white plaster contrasting with red trachyte. Its bell tower, which functions as a clock tower, was rebuilt during the 20th century. The interior has a large nave with three side chapels and marble ornamentation. Decorative features added after 1774, when the Jesuits left the city after the suppression of their order, contrast with the church's general sobriety; its paintings date to the early 20th century, in fact. An exhibition on sacred architecture in Sulcis-Iglesiente is in the church's underground rooms. The church is distinctive for its sober, decorative façade, reminiscent of embroidery. Framed by Corinthian columns and an architrave engraved with the Cannavera coat of arms, the doorway is in Gothic-Catalan style. The nave has a barrel vault, divided into four spans by pointed arches. Two chapels are on each side, dedicated to the corporations which financed the work. The chapels added in 1910 differ from the original building in displaying its exposed rock. Four memorial tablets include one dedicated to Bishop Nicolò Cannavera, who built the church. Saint Marcello Church was the headquarters of the San Marcello brotherhood and was adjacent to the Church of San Francesco until the end of the 19th century, when it was moved to make room for a primary school. The reconstruction project was planned by engineer Luigi Degrossi in 1901 with material recovered from the original church, including slate slabs for the inside flooring. The red, sloping neo-Gothic façade, its doorway containing a pointed arch, is all that remains of the original building. At the cusp of the arch, a Greek orthodox cross points to the rose window above; the top of the façade has a motif of small Gothic arches, identical to those on the windows of the bishop's palace. Saint Antonio Abbot dates back prior to the construction of the town (after 1258). On a hill near the Cixerri Valley, the church would have been at the centre of a small village. The building, which has undergone much reconstruction, has a simple facade with a gabled roof in the Byzantine style. Its facade indicates the church's age, traces of which remain in the present sacristy; neighbouring buildings have absorbed one of the original building's three naves.