Six hours of demanding hiking, above 4,600 meters, between hanging glaciers and meadows where cattle graze. At the end, with no warning, it appears: Laguna 69, a turquoise so intense it doesn't look real, at the foot of the snow-covered walls of the Cordillera Blanca. The effort leaves you breathless, but the view finishes the job. One of the most iconic and photographed images in all of Peru.