Welcome to Parque Natural del Hoz del Duratón
A dirt track leads 5km west from the hamlet of Villaseca to the Ermita de San Frutos. In ruins now, the hermitage was founded in the 7th century by San Frutos and his siblings, San Valentín and Santa Engracia. They lie buried in a tiny chapel nearby. This is a magical place, overlooking one of the many serpentine bends in the gorge, with squadrons of buzzards and eagles soaring above.
There's an excellent Centro de Interpretación in Sepúlveda with an informative permanent exhibition about the park, including the flora and fauna.