The Awesome Firefall of Yosemite Park...

Waterfalls are awesome, but the Firefall of Yosemite Park is definitely
something you don't see every day, literally Horsetail Fall is one
of the most beautiful waterfalls on the North American continent,
but it's only truly special for two weeks a year. The first firefalls of
Yosemite Park were man made. Large fires were started atop Glacier Point
and the red-hot embers were pushed down the granite wall,
in the evening. It was a nice show of fireworks
until the fire hazard of the 1960s, when the dangerous practice stopped.

But that didn't mean Yosemite was left without a firefall, if anything,
people got to discover a much more beautiful one. When the
natural conditions are just right, tourists can enjoy a unique
spectacle where water turns into burning fire. During the last two
weeks of February, when the sun shines above Yosemite Valley,
and water pours down the granite wall, the firefall phenomenon
takes place. But because clouds and storms are common during
the winter months, and sometimes California has dry years,
Horsetail Firefall can only be witnessed rarely, and timing is
of the essence.