I just found this article Every February Yosemite Waterfall turns to Lava .  It turns out it isn't actually Lava but the setting sun hitting a particular waterfall at a particular time.  This seems really cool.  I doubt I will ever be able to check this out.  The only time I expect to get to Yosemite would be in about 10 years and during Nathans school break in the Summer.  This takes place during February. 

I always thought waterfalls were awesome.  The power and beauty they possess.  The roar they make is just awesome.