Although you will never do this beautiful walk on your own, it is a must do if you are in the Alquézar area. You descend into the gorge between the Peña Castibián on the left and Muros de la Colegiata on the right until the Rio Vero. Once on the river bed you should definitely go to the Cueva de Picamartillo, this immense cave is opposite the Barranco de Fuente. Then it continues through the gorge via various spectacular metal walkways to reach a beautiful view platform.