Monte Castillo, Mountain summit in Cantabria, Spain

Monte Castillo is a conical limestone hill rising to 355 m in the Sierra del Dobra, in the municipality of Puente Viesgo, Cantabria. Its slopes hold four caves with rock art — El Castillo, Las Monedas, La Pasiega and Las Chimeneas — plus the Cueva de la Flecha, an archaeological site. A path climbs to the summit past viewpoints, caves and the adits of abandoned mines.

Monte Castillo is a 355-metre limestone hill in the Sierra del Dobra, in Puente Viesgo, Cantabria. Four caves with rock art open on its slopes: El Castillo, Las Monedas, La Pasiega and Las Chimeneas, plus the Flecha cave, which holds an archaeological deposit. The hill also preserves spoil heaps and gallery entrances from abandoned mines, and a path climbs past viewpoints to a summit cross, a Virgin in a humilladero and the remains of the castle that gave the hill its name.

The caves within this mountain preserve hand stencils and drawings that visitors can observe today, creating a direct connection to people from thousands of years ago. These images reveal everyday moments and rituals that took place in this region.

Access to the caves follows well-marked paths with varying difficulty levels suitable for different fitness abilities. Visitors should wear sturdy footwear and bring extra layers, as the caves can be cool even on warm days.

The summit holds a cross, a Virgin inside a small shrine (humilladero) and the remains of a castle, which likely gave the mountain its name. The path up also passes fenced mine entrances from abandoned workings on the slopes.