Firefall' happens in the winter, when Horsetail Fall is flowing and the sunsent hits the waterfall just right. The phenomenon ...

On a clear day, visitors at Yosemite National Park can once again catch a glimpse of the awe-inspiring "Firefall" effect.

Wilderness photographer Galen Rowell helped popularize the annual event, taking a radiant color photo of the glowing waterfall in 1973. The annual Firefall from Horsetail Fall in Yosemite Valley ...