10. Yosemite Firefall, California
In 1872, the owners of the Glacier Point Hotel overlooking Yosemite Valley would put on a show for their guests: they would throw bonfires into a waterfall to make it look as if lava was falling off the cliff.
While this was actually the original Yosemite Firefall that was specially created to attract travelers, the owners of the hotel didn’t know one thing—something quite important. Had they waited for the right weather conditions, the Yosemite Firefall would have naturally looked like it was spewing golden fire instead of water.
The optical illusion occurs each February when the sunlight right before sunset reflects upon the water. There’s even an official event held there where visitors can marvel at an entirely natural phenomenon that doesn’t need any human interference.
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