Just outside Castelsardo there is the characteristic Rock of the elephant, so named for its shape. Inside there are two Neolithic tombs, known as domus de janas, or fairy house. A few hundred meters you can also admire the typical Sardinian construction: the nuraghe.
Other places of historical and archaeological interest in the surroundings are the Church of Our Lady of Tergu, the Church of St. Peter of Images in Bulzi, the Necropolis of Su Murrone in Chiaramonti and its Castle of the Dorias, the Castle of the Malaspina in Osilo, the Domus de Janas in Sedini, the Sacred Well of Predio Canopoli in Perfugas, the Romanesque-Pisan Church of San Michele di Salvenero in Ploaghe.
All these places are reachable by road routes surrounded by countryside, luxuriant forests and granite rocks … especially without traffic! In addition you will always find the warm welcome of Sardinian people with their typical products of land and sea accompanied by their excellent and renowned local wines.
A few kilometers from Castelsardo, towards Valledoria, there is the Coghinas mouth , a river that for a long stretch is the natural boundary between the Gallura and the Anglona regions, and that you can run across it by boat or canoe and where the natural landscape, the flora and fauna are very rich.
Nearby you can relax at the Terme di Casteldoria; open all the year, it offers treatments of the highest quality thanks to the salsobromoiodic thermal water.
Another destination not to miss is the island of Asinara.
Virgin coasts, isolated landscapes, rare and characteristic species of plants and animals, such as the typical white donkey, the historical events sui generis … the island located at the extreme north-west of Sardinia, which separates the open sea from the Gulf of the same name, is a world apart, all to discover.
The natural wealth of Asinara, spread over more than 50 km 2, has been a national park since 1997 and a full marine protected area since 2002.