Each year from mid- to late February, Yosemite National Park's Horsetail Fall is lit up by the sun's rays when the weather is right, creating the illusion that the water flowing down is lava or fire. ... more 
Each year from mid- to late February, Yosemite National Park's Horsetail Fall is lit up by the sun's rays when the weather is right, creating the illusion that the water flowing down is lava or fire. The phenomenon is called a 'firefall.' less 
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LiveScience.com | Photo By Bethany Gediman, NPS
Tue, Feb 25, 2014 6:15 PM EST