While the caves in Capo Testa date back to the Roman era, they continued to supply granite up to the Pisan period.
The 16-th century Spanish tower of Longonsardo keeps watch over the Strait of Bonifacio
In the early 1800s, the commander of the tower Magnon asked the king for permission to build a town as a measure against the smuggling of goods between Corsica and Sardinia.
On 12 August 1808, King Victor Emmanuel I issued the founding decree for the town, which he named ater his wife Maria Theresa of Austria, and the layout of which he provided firsthand.
The strategic relevance of Santa Teresa Gallura was maintained up to the last century, as attested to by the numerous fortified watchtowers along its coasts.