The trail to the Altas Pinzas de Castilla Activity · Curiel de Duero, Campo de Peñafiel, Valladolid The PRVA-9 path climbs from the village up to this spot on the moorland, where caves inhabited in the Bronze Age are preserved with altars carved into the rock and views over the whole bank of the Duero. Photo: Juan Pablo Zumel Arranz (CC BY-SA 4.0) What to see and do in Curiel de Duero