I got lucky enough to see Cerro Fitz Roy on a clear day while hiking from El Chaltén in Argentina. The best route to seeing this famous peak is to take the Laguna de los Tres trek from the end of Avenida San Martín (follow the signs that say "Senda al Fitz Roy"). If you don't want to do the whole trek, which can take anywhere from 6-10 hours total, there is a mirador (lookout point) only about 2 hours into the trail from El Chaltén where you can see the mountains without climbing the high elevation. Fitz Roy can also be seen from the streets of El Chaltén, and is the town's mascot. You may also recognize the mountains' shape from the logo of the Patagonia clothing brand!