On a street in the very centre of town called Viale Trieste, and in the core of the historical quarter of Stampace (see also St. Michael's church) just a few minutes from Cagliari's harbour, you'll find an authentic, hidden treasure.  At number 98, inside a private yard, is the little San Pietro's church, mixed in with other very recent buildings.  Dated back to the XII Century, it represents one of the oldest churches in town.  It belonged to an old, medieval settlement situated along the shores of the S.Gilla marsh and destroyed by the Pisans in the XIII Century.
The construction, partially restored, has kept its simplicity and is aisle-less with a trussed vault.  The interior is also simple and contains two marble altars with two wooden statues of St. Peter.  On the right wall, there is a nineteenth-century canvas representing Our Lady of Sorrows, while on the opposite wall there is a curious pulpit placed on a confessional.
The church was owned by the Gremio of Pescatori (fishermen's union) for centuries and is very well kept.  Every Sunday, (sometimes Saturday) mass is celebrated.  The 29th of June , during Saints Peter and Paul's anniversary, an important religious event takes place.  The Saint's statue is carried on a procession.  Recently, during a series of concerts aimed at reviving Cagliari's forgotten, historical monuments, a polyphonic musical exhibition, coupled with a concert of "launeddas", the Sardinian traditional wind instrument, took place inside the church.