A few years ago, images of Rainbow Mountain in Peru began infiltrating my Instagram feed. The photos showed an above-the-treeline slope that looked like someone had dumped buckets of gold, pink, and ...

Among them is a mountain that appears almost painted, its slopes lined with striking shades that shift with light and distance. This high-altitude wonder, hidden in Peru, has slowly risen to global ...

The first impression is usually confusion rather than awe. From a distance, the slopes look painted in bands that do not ...