One of the many picture postcard landscapes that the Golfo degli Angeli (Gulf of Angels), has to offer, is a picturesque one to the west of Capo Carbonara: a sheer rocky promontory overlooking the sea, with an ancient watchtower standing above it, at the foot of which there is a tourist port and a welcoming, sheltered beach next to it. The setting is three kilometres from the town of Villasimius in a southerly direction: a Spanish-era defensive structure known as the Old Fortress has been standing here for more than five centuries. It is still in excellent condition and it contains a museum exhibition. Like all sixteenth-century coastal fortifications, the tower was built to defend the territory from barbarian incursions. Its origin is even older, perhaps dating back to the 14th century, which would correspond to its triangular-shaped central body, around which a structure with four towers was later built.