The limestone fortress of the mountain seems inaccessible, it is a labyrinth of towers, spiers and canals, which are called trancos in the mountains. The path continues east along the main path. In this section you can clearly see the work commissioned by the forestry engineer Enrique Mackay, at the beginning of the 20th century, to connect the forest houses of the mountain range.
The path is impeccable, it passes a gate at the entrance to Tranco del Perro, where it has a stark section, and climbs to the lunar terrain of Puntal del Águila and its procession of limestone “banderillas” that form the pedestal of the summit of Banderillas. The path leaves Tranco del Perro and a crossroads appears on a hill marked with stone markers. The summit route turns left, there is still a good squeeze left. The path on the right is the way down.