The white travertine formations caused by the geysers and springs at Mammoth Hot Springs.
I think this is near Fairy Falls, but I'm drawing a blank for some reason. It was just a great shot with the sky and clouds and little trees there in the shade.
The view north(ish) from a hill/small mountain we hiked up to get to Monument Geyser Basin. Extraordinary views. You see a lot of dead trees interspersed with the little green pines--that's from the fires of 1988. Those fires were the first to happen after the National Park Service (NPS) decided that, while it would protect buildings and people, it would no longer try to put out every single fire that started in its boundaries, whether it was human or natural in cause. 37% of the park burned that summer, which had seen record high temps and record low rainfall amounts. While folks were horrified to see the trees burned to crispy black sticks, it turns out that lodgepole pines actually need fire in order to reproduce on a real, grand scale--some of their seed cones won't open up unless the surrounding temperature gets over 150 degrees. What we now have is mile after mile of 6'-12' high green pines everywhere. Letting the 1988 fires burn themselves out was a controversial decision at the time, but we have to remember that forests work on a 20-50 year cycle, not a 1-2 year cycle like much of humans' timetables.