Olbia’s top sight is this medieval Pisan-Romanesque church, hewn out of Galluran granite. In the apse there are two 13th-century frescos, the left-hand one depicting San Simplicio, the patron saint of Olbia. The Festa di San Simplicio, Olbia’s biggest festival, is celebrated for three days in mid-May.
Address: Via Salvatore Fera, Olbia
Opening hours: Daily 7:30am-1pm and 3:30pm-6pm. In summer, closes at 7pm