Nature = lit

This is untrue. It's not caused by the setting sun, infact it's not even a real waterfall. As a publicity stunt the Yosemite National Park staff used to light a fire at the top of the mountain and then send a man up to slowly rake the glowing coals over the edge at sunset. The view, and resulting images (seen above) were beautiful. The park kept it going for a long time but eventually decided to stop because it was damaging the cliff face. I live right by the park, and I've been there countless times and seen the park's own documentary comomerating the "fire falls" of years past.

It's in California so it could actually just be on fire

Fire Falls? They say only the Ancient Kings were "BRAVE" enough to drink the fire.