(Photo: Chung Hu)
Horsetail Falls in Yosemite National Park, California is unlike any other in the world. Due to its location, direction, and shape, at a particular moment each year, it will appear to glow. Sunlight hits it at just the right angle to produce what appears to be a river of fire.
This is 1 of 20 of the most wondrous waterfalls in the world rounded up by When on Earth. They include a waterfall that is sticky because of the limestone content of its bed and one that flows directly into the ocean.