Best castles in Montes Obarenes-San Zadornil are found within the Las Merindades region of Burgos, Spain, offering a journey through medieval history. This area is characterized by its strategic importance, with fortified structures perched on natural rock formations. The castles provide views of the surrounding natural landscapes and reflect the region's rich past. Montes Obarenes-San Zadornil is a destination for those interested in historical architecture and scenic natural beauty.
Last updated: July 13, 2026
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The city of Frías, declared a Site of Cultural Interest in 2005, a medieval town in Las Merindades Burgalesas. In this town we can see the hanging houses, the Castle of Frías, the church of San Vicente Mártir, the Wall, the medieval bridge, convent of San Francisco, the church of San Vítores, the washhouse and the convent of Vadillo.
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It is always a joy to climb these ruins.
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I love this castle, very well equipped, accessible and with great views.
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Although Frías only has 267 inhabitants (as of 2022), the place can officially call itself a “city” (ciudad) - making Frías the smallest city in Spain.
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In my opinion, the most beautiful town in Burgos.
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Crowned by an imposing hilltop castle, the town of Frías offers cobblestone streets, stone houses and a suspension bridge over the Ebro River. Its old town retains its historic charm, with picturesque squares and a welcoming atmosphere. The town was built in a strategic enclave at the passage of the Ebro River, since Roman times and mainly during the medieval period.
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Ruins of an imposing castle located on top of a hill near the town of Pancorbo with excellent views of the Valle de la Campa and the town itself.
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A very charming town. It maintains a medieval urban structure that crowns the castle of the Velasco family and the church of San Vicente. The houses are attached to each other, reminiscent of the hanging houses of Cuenca.
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Visitors frequently highlight the impressive Frías Castle, known for its strategic location atop La Muela and its blend of architectural styles. Another popular choice is the Castle of Santa Marta, offering panoramic views from its craggy peak overlooking Pancorbo.
Yes, the town of Frías, with its castle, is considered family-friendly. Its picturesque medieval setting and the castle's accessible features make it an enjoyable visit for all ages. The town itself is often cited as one of the 'most beautiful villages in Spain'.
The castles in Montes Obarenes-San Zadornil are often set against stunning natural backdrops. Frías Castle offers captivating views of the Tobalina valley and the Ebro River. The Castle of Santa Marta provides unparalleled panoramic views of the Valle de la Campa and Pancorbo from its elevated position.
The region offers various outdoor activities. You can find numerous hiking trails, including moderate options like the 'Route of the Senses' or the 'Cuevas de Pancorbo y Peña Liebre' circular route near the Castle of Santa Marta. For cycling enthusiasts, there are routes like the 'Natural Park of Montes Obarenes - San Zadornil' circular from Frías. Explore more options in the hiking guide or cycling guide for the region.
Yes, for instance, hiking to the ruins of the Castle of Santa Marta is a popular activity, allowing you to appreciate its historical strategic importance and views. You can find routes like the 'Church of St. James – Watchtower loop from Pancorbo' which passes through the area. For more details, refer to the hiking guide for Montes Obarenes-San Zadornil.
While the castles can be visited year-round, spring and autumn generally offer the most pleasant weather for exploring the sites and enjoying the surrounding natural landscapes. These seasons provide comfortable temperatures for hiking and sightseeing without the extreme heat of summer or the chill of winter.
Beyond the castles, the region boasts other significant historical sites. The Alcázar de los Condestables in Medina de Pomar, also known as the Castle of Los Velasco, is a 14th-century Gothic fortress-palace that now houses the Las Merindades Historic Museum. Additionally, Espinosa de los Monteros is notable for its array of defensive towers and noble mansions, reflecting its historical significance.
For a comprehensive visit to Frías Castle and the picturesque town, plan for at least half a day. This allows time to explore the castle's interior, walk through the medieval streets, and enjoy the views. If you wish to combine it with a nearby hike or another attraction, a full day would be ideal.
While specific castle interiors may have restrictions, many of the outdoor areas and surrounding trails in the Montes Obarenes-San Zadornil Natural Park are dog-friendly. For example, the hike to the Castle of Santa Marta is an outdoor activity that can often be enjoyed with a well-behaved dog on a leash. Always check local regulations for specific sites.
Visitors consistently praise the strategic locations of the castles, which offer breathtaking panoramic views of the surrounding valleys and natural parks. The historical significance and well-preserved medieval architecture, particularly at Frías Castle, are also frequently highlighted. The blend of history and nature makes for a captivating experience.
Generally, parking is available in the towns or villages associated with the castles. For instance, in Frías, there are parking areas within or just outside the town. For the Castle of Santa Marta, you would typically park in Pancorbo and then hike up to the ruins. It's advisable to check local signage upon arrival for specific parking regulations.


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