On the west ridge of Charquini (5,392m), about 800m away from the summit and maybe 100m lower, stand a few towers and needles. Most of these have been climbed by their easy west flank, but several have impressive northeast faces, and are connected by a relatively easy but exposed ridge. Rodrigo Lobo and I first saw these towers while sport climbing around Zongo Pass. [Other local climbers have noticed these needles of good granite with protectable cracks, but remark that the drive, combined with a long approach on foot to a relatively high altitude, probably explains why they have not received much attention.]. In August and September, we stayed a month with a sheep farmer and his family at around 4,800m, just before the road drops towards the lowlands.

One morning we got up early and walked up to the First Tower, the one nearest Charquini. We started our climb at the steepest section of rock on the left side of the northeast face and followed a system of corners and cracks. These led to a picture-perfect crack through a roof that finished a few meters left of a huge rock sticking out from the summit area and forming a weird overhang. Rodrigo led this pitch. Some sections were overhanging, and disconnections meant you had to change from crack to face climbing. Protection is good—the hard section is a clean Camalot 2 crack, 10–15m long)—and the grade 6c–7a. It is the most beautiful crack pitch I've ever climbed.

From the top of this tower, we followed the easy ridge west to the Second Tower, where an impressive crack ascended the northeast flank. Face climbing, then an offwidth, and finally a steep arête led to the top (40m, 6b+).

We continued west, climbing over several more towers. The further we progressed, the more the rock quality deteriorated, but we continued over all the towers—the First, Second, and Fifth have potential for more routes—and returned to our accommodation in the dark.

Later, I returned to the First Tower alone and climbed its east ridge. The hardest part was 5c, but most of the route was somewhat easier.

I also made possibly the first solo ascent of the south ridge of the most southerly (ca 5,300m) of the four Milluni summits. There were three pitches of 5, but the rest is easier. I took no rope or harness and downclimbed the rappels on the normal but complicated route on the east ridge. The south ridge is highly recommended and well protected. It was supposed to have been climbed first in the 1970s by Alain Mesili but appears to be rarely repeated.

Rodrigo and I also tried a short, eye-catching, overhanging needle on the ridge leading to the highest of the Milluni summits. We reached the needle via three pitches of fine crack climbing up to 6a+. However, our attempt to climb the final needle by a weird dihedral failed after several hours of attempts. We turned to an easier option and climbed it at 6b.

The classic traverse of the Milluni summits isn't done very often. The rappels are now equipped with bolts, though they are difficult to spot.

— Robert Rauch, Bolivian Tours