Monte Argentario is a wild and uncontaminated promontory once used as a defensive fortress; indeed, its old military function is still visible today. The area’s cultural heritage is tied to the noble Aldobrandeschi family, though it was later dominated by the Republic of Siena and fortified by the Spanish between the 15th and 16th century.
The Spanish Fortress in Porto Santo Stefano is an enormous tower that measures 35 x 35 square meters distributed on two levels. Built during the second half of 16th century, the building was meant to fortify and defend the area. It now features two terraces, one that affords beautiful views of the sea.