The Basilica of Bonaria (that is placed in the piazza of the homonymous hill) which consists of two Churches (the older one belongs to the XVII century) dedicated to the Blessed Virgin of Bonaria. It gets a Gothic style's portal. The Basilica of Santa Croce in the homonymous via, which was erected in 1661 on the ruins of a synagogue (after the expulsion of the Jews by Ferdinan-do the Catholic); it was connected to the College of Jesuits till the abolition of the order (1773) and in 1809 it was declared Basilica Magistrale by the Mauritius. The internal has only a nave and some barrelled vault chapels laterally. The Cathedral of S. Maria in Piazza Palazzo 11°4 (that was set up between the XII century and the XIII century),which shows various artistic styles in its single parts (Romanesque, Pisan, Aragonean, Spanish) as the pulpit of the Pisan sculpture Mastro Gesualdo (1159-62), that was placed previously in Pisa Cathedral and replaced here in 1312.

The C. of the Purissima in Via Lamarmora, built in the XVI century, which gets a Gothic-Aragonean nave with some side-chapels in the inside, and a circular window with a circular arch-portal in the outside. There are other important civic Churches too, as the S.Giuseppe one in the homonymous piazza (XVII century), with a nave and three chapels in both sides, the presbytery and a Ionic front; the C. of S.Domenico (in the homonymous via) of the XVIII century which gets evident traces of the Spanish dominion (the patio in Gothic-Aragonean order that comprises a loggia provided with 4 wings); the C. of Sant'Agostino in Via Baylle edified in the XV century which was reconstructed with a classic style of Rinascimento unique in the island and that has notable Roman founds (the remains of the saint were kept in the Crypt of Largo Carlo Felice).

The Church of S.Saturnino (or the C. of Cosma and Damiano) in Piazza S.Cosimo, the main testimony of the Christian architecture in Sardinia (that dates back to the V century) which remembers the martyrdom of Saturnino (the patron saint of Cagliari who is celebrated on October 30); it has a central side with domes on 4 pillars, a barrelled vault nave and the side ones with cross-vaults and cross-arches; the C. of Carmine (XVI century) in the homonymous piazza, the C. of S.Caterina (in Via Sea-no of Genoan type (XVI century), the C. of S.Michele in Via Ospedale n°2 (XVII century) in Baroque style (which gets precious pictures and worth furnishings into its sacristy) and the C. of Sant'Efisio in the homonymous via

The Porta Cristina in Piazza Arsenale (it was left here by the Count Carlo Boyl in 1825 and the name derives from Maria Cristina of Savoy); P. Castello or P. dei Leoni in Via Universita; the P. di San Pancrazio in Piazza Indipendenza (its slope is called "S'Avanzada"); the P. dell'Aquila in Via De Candia (its name derives from an old Pisan tower which is joined today to the Palazzo Boyl). The Torre dell'Elefante in Via Universita datable on 1307 (built by Giovanni Capula in Pisan period), where there is the Porta dell'Elefante provided with closing systems in its inside that were in function when the tower was used like a prison; the T. di S.Pancrazio of 1305 (with the same notes of the previous one), in Piazza Indipendenza, which is the highest tower of the whole Cagliari.

The Bastione di S.Remy in Piazza Costituzione that was erected joining the three Bastions of S.Caterina, S.Remy and Zecca; on the Terrazza Umberto I is admirable the panorama of the town and the Golfo degli Angeli, and a stairway near the Passeggiata Coperta arrives in Piazza Costituzione. Concluding, the B. di Santa Croce has a terrace that offers a nice view on the sea and of the Lagoon of Santa Gilla.