I have always loved Yellowstone. These pictures are from Mammoth Hot Springs in Yellowstone. When we were there in 2007 it appeared to me as though there wasn't as much water there as there was when we visited in the late 90s. There is a short video about Mammoth Hot Springs located here and a bunch of videos all over Yellowstone located here. Even though I've been to Yellowstone twice I would love to go again.