Cordillera Blanca is one of those places that raises admiration mixed with a great respect. Trekking here is not easy, as at so high altitudes there is little oxygen and every step up is a fight. But it is a battle worth fighting, the views at the end are breathtaking.
I think the pictures speak for themselves.
The two glacier lakes on the pictures are Laguna 69 (4600m) and Laguna Churup (4450m).