Holding a place of pride among the oldest early Christian monuments in Sardinia, the Basilica of San Saturnino is a major historical site in the city of Cagliari. This majestic temple, located on Piazza San Cosimo, was erected as early as the 6th century on the site of an ancient necropolis where, according to legend, the city's patron saint, Saint Saturninus, was martyred.

The architectural appearance of the basilica represents a fascinating synthesis of eras. It preserves a unique central part with a Byzantine dome from the 5th–6th centuries, which stands alongside Romanesque elements added in later periods. Although the building repeatedly suffered from destruction and historical conflicts within Italy, extensive restoration has returned it to its former glory, making it accessible to modern travelers.
Today, the site functions as a national museum and an active church, where the simplicity of the interiors emphasizes their antiquity and spiritual significance. Visitors are drawn not only by the architecture itself but also by the opportunity to see archaeological excavations right at the foundation of the temple, where research into early Christian burials continues to this day.