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 ...

At first glance, the mountain in the Peruvian Andes, with its bands of soil the color of turquoise, lavender, red-violet and gold, seems Photoshopped. But the otherworldly sight, standing 16,000 feet ...

The first time most people see a picture of Peru’s Rainbow Mountain, they assume it’s been edited. The bands of red, yellow, green, and turquoise look too perfect to be real. But this geological ...