Many people consider it one of the most beautiful military works of 19th century Europe. It defended a sea, crossed by Napoleon, Admiral Nelson and Domenico Millelire almost a century earlier, and today it tells its story and offers an enchanting view of the Maddalena Archipelago National Park. The military fortress of Monte Altura stands in Palau, on the hill of the same name to the west of the residential area, a few steps away from the picturesque village of Porto Rafael. It was part of a complex of three military structures, along with the fortresses of Capo d’Orso and Barragge. It was built in record time, in just two years, between 1887 and 1889, using locally-extracted granite stone. This choice had two advantages: faster construction times and, above all, a ‘camouflage’ effect: the buildings in the complex seem to blend into the rocks of the hill.