Firefall is a natural phenomenon that occurs a few days a year when the setting sun hits the east face of El Capitan in Yosemite Valley at just the right angle to illuminate Horsetail Fall in such a way that the water looks like lava spilling over the rock. One weekend in February the conditions were perfect - the melting snowpack above El Capitan provided enough water flow while the low clouds hanging in Yosemite didn't block the light.
I have to say the experience itself exceeded my (already pretty high) expectations. I've never been and I thought it's one of those things that looks much better in photos than while you're seeing it, but the in person experience was actually amazing. The color lasted for 15 mins and the communal experience of watching it with lots of people screaming and clapping at the end was fun.
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