Amid the resorts of Sardinia's northeastern coast, Olbia, a town of about 60,000, is a lively little seaport and port of call for mainland ferries at the head of a long, wide bay.San SimplicioOlbia's little Catholic basilica, a short walk behind the main Corso Umberto and past the train station, is worth searching out if you have any spare time in Olbia. The simple granite structure dates from the 11th century, part of the great Pisan church-building program, using pillars and columns recycled from Roman buildings. The basilica has a bare, somewhat somber interior, its three naves separated by a series of arches.