Located on Sardinia's northeastern coast, Olbia has been a major port since ancient times — ruled by Phoenicians, Greeks, Carthaginians, Romans, Pisans, and Aragonese. These days, it's known as the gateway to the Costa Smeralda (Emerald Coast), which is ruled by jet-setters. Though you'll likely want to get out of town to explore Sardinia's beautiful scenery, Olbia does offer some sights and shopping.