Sagres Fortress (Fortaleza de Sagres)

Sagres Fortress occupies a vast rocky promontory at the western edge of the Algarve, its 16th-century ramparts enclosing a broad open plateau above sheer cliffs where the fortress's simple, low walls were built to withstand Atlantic storms and past cannon fire rather than to impress. According to long-standing local tradition, Prince Henry the Navigator established a school of navigation and cartography on this headland in the 15th century, a legacy that made Sagres a symbolic starting point for many of Portugal's Age of Discoveries voyages. Inside the walls, visitors can see the large stone compass rose (Rosa dos Ventos) set into the ground, believed to date from this navigational history, alongside the small whitewashed Nossa Senhora da Graça chapel and a modern interpretation centre with exhibits on the site's maritime past. Walking the full perimeter of the fortress walls takes about an hour, with the open plateau offering uninterrupted views along the cliffs toward Cape St. Vincent, 6km to the west. The site is least crowded in the early morning, before tour buses arrive from the coastal resorts, and the exposed plateau catches the same strong Atlantic winds as neighbouring Cape St. Vincent, so a windbreaker is useful even in summer. A visit pairs naturally with Cape St. Vincent as part of a single outing to the western tip of the Algarve, and the small town of Sagres below offers cafes and seafood restaurants for a break after exploring the fortress.