In the coastal city of Olbia, be sure to explore the cozy old town and the harbor. Driving along the Emerald Coast, you'll pass stunning beaches and many secluded coves that are only accessible by car. From Olbia, the route heads into the mountainous interior and through small mountain villages before winding down a curvy road to the port city of Alghero on the island's west side. The city, surrounded by historic walls, is known for its Catalan-Gothic architecture and cobblestoned old town. The top attractions in Alghero include the Cathedral of Santa Maria with its tall bell tower, the 14th-century Church of San Francesco, and the Palazzo Guillot. The Coral Museum of Alghero showcases red coral and other fascinating exhibits. From there, the journey continues along the west coast. The panoramic road leads to Bosa, one of Italy's most picturesque towns, situated at the mouth of the Temo River. In Bosa, you can explore the old town and visit the Serravalle Castle. On the way to Cagliari, Sardinia's capital, a swim or a beach walk at one of the sandy shores overlooking the azure sea makes for a perfect break.