Rounded hills cloaked in Mediterranean green, local breeds such as the white donkey, and the thousand colours of the sea and its teeming sea bed. Asinara's natural heritage, which stretches over 50 square kilometres within the territory of Porto Torres, was designated a national park in 1997 and protected marine area in 2002. The island's extraordinary history, separated from the mainland by Piana island and the road through Fornelli, has kept it intact.
The earliest traces of human activity is the domus de Janas in Campu Perdu. In the 20th century, the area became the criminal wing of the local jail, in particular hosting the stables where the prisoners worked. The medieval period is represented by the ruins of the Camaldolese convent of Sant'Andrea and the Castellaccio castle, set on a hilltop with a path leading up to it.