In the heart of the old town, the Saint Remy Rampart is one of the most important monuments in Cagliari and one of the most prestigious exhibition areas in the city centre.

The Saint Remy Rampart is to be numbered among Cagliari's most valuable monumental complexes. Built on the ancient defensive curtains of the medieval boundary walls, owes its name to the first Piedmontese Viceroy, Baron of Saint Remy.
The majestic panoramic terrace "Umberto I" and the underlying gallery known as Passeggiata Coperta were designed in 1896 by Giuseppe Costa e Fulgenzio Setti. The imposing structure, built in a classic style, with white and yellow limestone columns and corinthian capitals, was inaugurated in 1902. In 1943, the double flight of steps and the triumphal arch were gravely damaged by War World II bombings, but later the distroyed parts were accurately reconstructed.

Over time, the Passeggiata Coperta housed several activities. At first, the gallery was used as a banquet hall, but in the war period served as an infirmary and later as a shelter for people displaced by the bombings.
In 1949, it housed the first edition of the International Trade Fair of Sardinia. 

The Balice Rampart is part of the fortification walls of Castello. The visit is possible passing through the University Palace.

The Balice Rampart was designed by the architect Rocco Cappellino; thanks to its strategic position in the environs of the Elephant Tower, it faced the enemy attacks coming from the sea.

The bastion is not provided with an entrance, consequently is hard to locate it. In fact, it is reachable only passing through the University Palace, whose backyard stands on the Balice Rampart. 

Religious complex consisting of a small Catalan Gothic church dating back to the 14th century (the Sanctuary) and the Basilica, which was built around the 18th century in the Neoclassical style.
The Sanctuary Museum safeguards archaeological finds, naval models, church ornaments and ex-votos.

The Sanctuary, headquarters of Mercedario’s order, houses the wooden statue of Madonna with Child in her arms, which according to the tradition, miraculously arrived at the cost in front of Bonaria's hill in 1370.The legend says that a ship ,probably coming from Spain, was surprised by a storm, which suddenly calmed down only when the box containing the statue, was thrown into the water.

The devotion to the miraculous statue spread throughout all Sardinia, especially among sailors, who invoked her as protector. Spanish Conquistadors, named the city of Buenos Aires as "Puerto de Nuestra Señora de los Buenos Aires", in honour of the Sardinian sanctuary. The feast of our Lady of Bonaria is celebrated on 24th April, while on 25th March is remembered in a solemn way, the prodigious arrival of the Virgin Simulacrum. On the first Sunday of July, take place the summer feast, during which the statue of the Virgin is carried in procession to the sea.

Formerly a Sinagogue, it stands in an area that once was the Jewish ghetto. It was converted into a Catholic church after the expulsion of the Jews from Cagliari around 1500. It keeps works by Sardinian painter Giuseppe Deris.

Inside the church there is an only  nave, with three chapels for each side and a little chancel closed by a curvilinear apsis. The lateral chapels are decorated with altars in Baroque style and  they contain different artworks dating back to 17th and 18th century. The Barel vault is decorated with a motif of hexagonal panelled, painted by Ludovico Crispi in 19th century.

In the high altar stands out a wooden crucifix,while on chancel's side are represented St. Maurice and St. Lazzaro, two artwoks by a sardinian artisan, Antonio Caboni, date1824. The facade, preserves the emblem of the Jesuit order, who renovate and enlarge the church in 1661, thanks to the noblewoman Anna Brondo from Villacidro,who made a donation.

Paleochristian complex dating back to the 5th century, which includes the Byzantine-Protoromanesque church (also called Church of SS. Cosma e Damiano) and the Christian necropolis, in which many Byzantine and Roman Age remains were found.

Risen up as Martyrium for the martyr Saturnino, the church was donated to Vittorini monks from Marsiglia, who founded a priorate and renovated the church in Romanic Provençal style. In the first part of the 14th century, during the Catalans siege, the cloister was seriously damaged, tumbling down a century later. The church was restored again in 1484.

Approximately in 1614 began the excavations to find the so called " holy corpses", that is to say martyrs' relics or something supposed to be that, while in 1669, the church was demolished in part, to extract useful materials for the restoration of the Cathedral. In 1714, the chuch was given to the corporation of Medici ad Speziali who dedicated it to their protectors, the Saints Cosma and Damiano.

The church was seriously damaged during the bombing in 1943, and, after several restauration woks, it was opened again to the ritual in 1996.

The Dusay Bulwark is a military architectural testimony built between the late fifteenth and early sixteenth centuries in the Saint Pancrazio area, in transition between the Middle Ages and the modern age. The space Saint Pancrazio was born as Dusay Bulwark for the defence of the north face of the Castle. In Europe, around the middle of the fifteenth century, the advent of fire guns began a process of adaptation and modernization of military defences of medieval origin. The architectures that characterized that historical period were defined as transitional, but, in fact, they represent a precise response to the needs that emerged from the conditions of war, in any case transitory.