This is the nice looking spike that can be seen from the refugio just to the left of the saddle a good ways past M2. La Vieja contains about 10 routes, some of which are bolted.
From the refugio, hike up to the saddle and continue going up it keeping an eye out to your left. At a point when you are at roughly the same elevation as the base of the spike you'll be able to drop off the ridge/saddle and cross over to the base. It's about a 45 minute approach.
Browse More Classics in La Vieja
Mountain Project's determination of some of the classic, most popular, highest rated routes for La Vieja:
Del Frente 5.9 Trad, 2 pitches, 260 feet
Featured Route For La Vieja