Porto Santo Stefano is the largest seaport town of Monte Argentario and is located on the northwester promontory. In Porto Santo Stefano you can find a picturesque bay with an old port, a lively marina with yachts, restaurants and shops and colourful houses perched on the promontory. Because of its good geographical location, it has been inhabited since ancient times and the Romans left significant traces of their presence, including the remains of the baths of Domitian. Under the domination of Siena the place was often attacked by pirates, so many coastal towers where built. After various dominations (French, Spaniards, Austrians, Bourbons) it went under the Grand Duchy of Tuscany. During the Second World War, Porto Santo Stefano was the scene of violent bombardments, resulting in the loss of many civilians. The Spanish Fort, a military structure that was built by the Spanish between the end of the 16th and the start of the 17th century, overlooks the historical centre of the town and was completely restored in the second half of the last century. Today it hosts the Museum of Axe Masters and other displays that include local archaeological artefacts.