In reply to Gone for good:
Yeah, it's the Peruvian Andes.
You'd need to fly to Lima, then get an overnight bus to Huaraz.
There are numerous variants of the trek itself, but expect to spend 12 days or so on the trail.
You'll spend most of the time above 4000m, and by the time you get back to Huaraz you'll be very acclimitised....it would make sense to go for a peak.
Of the 'easy' Peaks, Pisco (grade PD) is probably the best. You can be up-and-down in a couple of days and the views are unbelievable.
Alternatively you could do the shorter Santa Cruz trek, and spend more time peak bagging.
This should give you an idea of how it works out there: