High in the Lozoya Valley, hidden in the cold and dark northern slopes of Cabezas de Hierro, inside the thicket of the pine forest, the yew tree of Valhondillo hides. According to some studies, the longest-lived tree in the Iberian Peninsula. Yews are associated with death in many cultures, perhaps due to their legendary longevity and the fact that they are poisonous in all their components except for the covers of the seed. Finding a mature yew tree in the forest always means facing the enigma of time, a solemn and ancient living being full of mystery and omens. That is the feeling that we intend to look for in this forest route, on the other hand located in one of the wildest and most beautiful corners of Guadarrama National Park.