Castrillo de los Polvazares was on the medieval Camino. Today you will find it away from the crowds, on a very short ( 1km in total ) alternative route. It is considered one of the most beautiful villages in Spain and well worth the short detour. The road is very well marked on the way out of Castrillo but you need to take care coming in from Murias de Rechivaldo. Follow the instructions below to avoid road walking.
Just before leaving Murias de Rechivaldo by the Camino, turn right on Calle Nueva towards Murias Albergue municipal. At the Albergue cross the main road and turn left past Casa Flor on to the main road. After 200 m take the path on the right, that runs parallel with the road. Castrillo straight ahead. Keys and reception for the albergue are at Flores Del Camino - on the main street Calle Real 36. (See map below)