Check out the photos of the "Fire Waterfall" in Yosemite National Park. The waterfall is actually Horsetail Fall on the east side of El Capitan.
At first I thought that maybe this was a hoax, or maybe they were photo shopped images, but apparently they're real. The spectacular view of the waterfall is created by the reflection of sunlight hitting the falling water at a specific angle, and can only be seen during a 2-week period towards the end of February. Thus, seeing and photographing this phenomenon is fairly rare.
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