Seeing a waterfall on fire might be mildly alarming, but for this New York State falls, it's a constant state of being, but scientists don't know why.

the setting sun hits Yosemite's Horsetail Fall along the eastern edge of the soaring El Capitan at just the right angle, creating the illusion that the 1,575-foot waterfall is on fire. This year ...

An curved arrow pointing right. Every February, Horsetail Falls, which cascade down the famous El Capitan cliff in Yosemite National Park, become a fiery orange, illuminated by the setting sun.