The best way for you, as a mere mortal, and not some semi-suicidal mountaineer to experience big mountains is to take the bus from Santiago,Chile to Mendoza, Argentina. The trip through the Andes is really awesome. Sometimes you'll see a mountain and have no idea how big it is and then at the very bottom you can just barely make out some ant size cows grazing. Looking down at the bottom of some of the switchbacks on that route is like looking out an airplane window.