Valley of the Witches Curiosity · Guardo, Alto Carrión, Palencia Image of Guardo, not of the place itself. A short 5-kilometre trail runs through the so-called Valle de las Brujas, a place name that gathers up the tradition of witches' covens in the upper Carrión and that gives its name to one of the literary routes waymarked in the municipality. Photo: Alejandro Polanco (CC BY 3.0) What to see and do in Guardo