Fuerte de Nuestra Señora de Guadalupe is one of the largest and best-preserved military fortresses in the Basque Country. Located high on Mount Jaizkibel above the town of Hondarribia, the fort offers visitors a fascinating combination of military history, architecture, and spectacular panoramic views over the Bay of Txingudi, the Cantabrian coast, and the French border.
The fortress was built in the late 19th century as part of a defensive military system designed to protect the strategic border area between Spain and France. Following the Carlist Wars and the modernization of military engineering in Europe, the Spanish army constructed several forts around Gipuzkoa to reinforce coastal and frontier defenses. Thanks to its elevated position, the Fort of Guadalupe controlled important access routes near Hondarribia and the Bidasoa estuary.
The complex was designed according to modern military principles of the time, with thick defensive walls, underground galleries, artillery positions, barracks, ammunition storage areas, and hidden tunnels. Although the fort never saw major combat, it remained under military control for decades and today is considered one of the most important examples of 19th-century military architecture in northern Spain.
Currently, visits to the fort are managed by Fundación Arma Plaza. One of the most interesting ways to discover the fortress is through the guided tour called Los lugares prohibidos del Fuerte de Guadalupe (“The Forbidden Places of the Fort of Guadalupe”), which allows visitors to access areas that are normally closed to the public, including underground spaces and hidden military structures.
The guided tours are offered in Spanish and Basque, usually on Saturdays and Sundays. Since places may be limited, advance booking is recommended, especially during summer months. Comfortable footwear and a light jacket are also advisable, as some underground sections can be humid and cool even during warmer seasons.
Posted on May 9, 2026
