Best attractions and places to see around Fronteira, a municipality in the Portalegre District of Portugal, showcase its historical and cultural heritage. The region features ancient megalithic monuments and significant religious sites. Visitors can explore historical buildings and natural recreational areas, characteristic of the Alentejo landscape.
Last updated: May 20, 2026
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Located in the parish of Seda, in the heart of the Alentejo, the ruins of the walls that surrounded the ancient castle of Seda remain determined to preserve their ancient history. Without official evidence, some studies point to the existence of a castro of the Lusitanian tribe, occupied by Roman troops who would have erected a fortification there. The Roman presence in the region is well-known, and easily attested to by the Vila Formosa Bridge (1st and 2nd centuries), milestones, and the military road that would have connected Lisbon to Mérida. In 1160, King Afonso Henriques conquered the village, which at the time was called Arminho, from the Moors and donated the fortification to the Templars. This is the date that marked the beginning of the village's original enclosure. During the reign of King Afonso III, the village was handed over to the Order of Aviz and was later elevated to the status of a town, even serving as the municipal seat until 1836. The castle, however, gradually lost importance, and only a section of medieval wall, reinforced with turrets, has survived to this day. It has been classified as a Property of Public Interest since 1982.
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A suspension bridge that looks very similar to the "25 de Abril" bridge. This bridge predates the Lisbon bridge. Originally, the roadway was made of pine wood. Currently, it is made of metal.
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The Castle of Alter do Chão, in Alentejo, is located in the parish of Alter do Chão, in the town and municipality of the same name, district of Portalegre, in Portugal. In the historic center of the town, this castle is representative of 16th century medieval architecture, when it cooperated with the neighboring Castle of Alter Pedroso in the defense of this region. Alter do Chão Castle has been classified as a National Monument since 1910.
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Magnificent medieval castle which was reconquered from the Arabs during the reign of D. Afonso II. It is classified as a National Monument.
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The Ribeira Grande bridge was completely submerged and partially destroyed during the floods of December 13, 2022. It was built right next to a temporary bridge.
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The Sanctuary of Nossa Senhora da Vila Velha is a beautiful Sanctuary with a splendid viewpoint. Our Lady of Vila Velha is the patron saint of the beautiful city of Fronteira. The devotion to this patron saint was reinforced when in 1694, during a pilgrimage, lightning fell during a feast and no one was injured.
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Fronteira is rich in history. You can visit the impressive Alter do Chão Castle, a National Monument with 16th-century medieval architecture. Another significant historical site is Seda Castle, where you can explore the ruins of its ancient walls, which have connections to Roman times and the Templars. The region also features ancient megalithic monuments, including cromlechs and dolmens in the Megalithic Necropolis of Herdade Grande, and the Battle of Atoleiros Site, which commemorates a crucial battle for Portuguese independence.
Yes, Fronteira has several notable religious sites. The Sanctuary of Our Lady of Vila Velha is a beautiful sanctuary with a splendid viewpoint, dedicated to the patron saint of Fronteira. Its origins date back to the Middle Ages, and it hosts an annual pilgrimage. Other important religious monuments include the Mother Church, and the Churches of Espírito Santo and Senhor dos Mártires.
For nature lovers, the Ribeira Grande Ecotourism Centre offers a lush natural environment with a river beach, pools, and footpaths, perfect for sports and leisure. The region is known for its beautiful landscapes and vegetation, typical of the Alentejo. You can also visit Cabeço de Vide and the Termas da Sulfúrea, known for their unique sulphurous thermal waters.
Absolutely. The Montalvo Suspension Bridge is a remarkable sight, predating the famous Lisbon bridge and featuring a metal roadway. Another historical structure is the Old Fronteira Railway Station, inaugurated in 1937, which still stands and features decorative tile panels by Leopoldo Battistini depicting rural life scenes. It's now part of the Ecopista Atoleiros – Sulfúrea.
Fronteira offers several road cycling routes that allow you to explore the area's attractions. You can find routes like the 'Alter do Chão Castle – Ribeira Grande Bridge loop from Avis' or the 'Alter do Chão Castle – Seda Castle loop from Alter do Chão'. These routes vary in difficulty from moderate to difficult and are a great way to experience the region. For more details and route options, check out the Road Cycling Routes around Fronteira guide.
Yes, several attractions in Fronteira are suitable for families. Both the Alter do Chão Castle and the Sanctuary of Our Lady of Vila Velha are considered family-friendly. The Ribeira Grande Ecotourism Centre, with its river beach and pools, also provides excellent opportunities for family fun and outdoor activities.
While specific weather data isn't provided, the Alentejo region generally experiences hot, dry summers and mild winters. Spring (April-May) and Autumn (September-October) are often ideal for outdoor activities like cycling and exploring historical sites, as the weather is typically pleasant and the landscapes are vibrant.
Yes, the Sanctuary of Our Lady of Vila Velha is not only a religious building but also offers a splendid viewpoint, providing panoramic views of the surrounding area. The natural landscapes around Fronteira are generally noted for their beauty, offering many scenic spots.
The Battle of Atoleiros site, very close to Fronteira, marks a pivotal moment in Portuguese history. It was here in 1384 that Castilian forces were defeated, a crucial battle that helped secure Portuguese independence. The Battle of Atoleiros Interpretation Center aims to educate visitors about this significant event and the role of Nuno Álvares Pereira.
Yes, the Fronteira Municipal Library, opened in 2005, serves as a cultural and educational hub. It offers a wide collection of books, reading rooms, internet access, and a multi-purpose room used for exhibitions, lectures, and various cultural events, making it a great resource for both locals and visitors.
The Ribeira Grande Ecotourism Centre is a fantastic destination for nature and recreation. It boasts a lavish natural environment with lush vegetation, a river beach for swimming and relaxation, pools, and footpaths for leisurely strolls. It also features an astronomical observatory equipped with state-of-the-art technology, offering unique stargazing opportunities.


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