Grand Prismatic Spring

Un. freakin. believable.

I think this is the coolest sight I've seen on this trip. The various bacteria and algae color the water according to the different temperatures of the spring. The walkway going by is a good 10 degrees warmer than the rest of the park because of all the heat rising off the water. This is one that must be seen to believe. It's a whole lot bigger than this picture makes it look.