We visited several sites where there are geysers and fumaroles and boiling pools and mud holes dotting the ground.
The colours are really astounding, like in this turquoise pool. And the colour of the water in the Firehole River is even more brilliant.
But for me the most thrilling was to see the wildlife in the park. We saw a grizzly bear, a herd of elk, some pronghorn antelope and many, many buffalo. I'd never seen these creatures before and they are very imposing. Apparently they can run at 30 miles an hour so you don't mess with them. I loved seeing the herd grazing on the beautiful golden grass with the steam from the geysers in the background.
This fellow was by himself though, far from others. We saw him at the summit of the pass exiting the east side of the park. He was slowly trotting up the road at about 8600 feet. I sure hope he made it where he was heading.