In Olbia the ancient basilica of San Simplicio in honor of the patron

The basilica of San Simplicio, in Olbia, was constructed at the end of the XI century and completed at the beginning of the XII. Dedicated to the Saint patron of Olbia and Gallura, martyred when Rome was under the guide of the Emperor Diocleziano, it guards in its interior a wooden simulacrum (head and shoulders) representing San Simplicio and going back to the XVII century. This Romanesque church has carried out the functions of cathedral during the times of the Giudicato of Gallura, when the town was called Civita Terranova (previously, it has changed its name several times). In the large square in front of it, are still present some milestones planted by the Romans along the road that connected Olbia to Telti.

In Aggius is worth a visit the church of Santa Vittoria, whose original system goes back to the XVI century (but are clear the modifications brought with the restorations of the XIX century).

Small but fascinating, the church of the Purgatorio (in Tempio Pausania) is worth a visit as well. It was build up in the XVII century for want of the Spanish nobleman Jean Missorro, escaped to an bloody rustic duel: it was an attempt to reconcile with God. In the same citizen is very interesting also the church of the Pilar, constructed by the Spanish. But above the others rises the cathedral of San Pietro, raised at the beginning of the XV century and refurbished during the half of the XIX, the church of the Rosario instead is decidedly more ancient (XIII century): it is narrated that the Romans constructed in that point a temple dedicated to Castore and Polluce.