The city of Olbia is in the north-eastern coast of Sardinia, in the most inner part of the homonymous gulf, in front of the little island of Tavolara. It is one of the most important port and airport call in Sardinia. The surroundings of Olbia are full of interesting archaeological sites and of evidences of ancient cultures: as the Nuraghis, the Tombs of Giants and the Sacred Wells. Olbia has many secret to discover, as the so-called Giants Tomb of Monte s’Ape. On the top of a hill, there's Rio Mulinu, a nuragic castle with a well in the middle. Five kilometres from the city, along the panoramic road that leads to Golfo Aranci, you will find the Sacred Well of Sa Testa (VIII-VI century b. C.).