One especially full day was spent around the Tower Falls area. That was the day we took a soak in the hot spring along the Gardiner River. But later we headed out for all kinds of sight-seeing and hiking. Here's just a small portion of the stuff we saw that day:
You can really see the soft stuff that makes up much of the underlying material in Yellowstone. It's obvious that the place was just a huge caldera full of exploded rock and dust. The rivers cut through it like it's soft chalk. Which, basically, it almost is.
I enjoyed this hike to the river. It was peaceful down in the gorge--almost no other people were there. All I had to do was hike back up. Of course that wasn't nearly as tough a hike as climbing out of Linville Gorge.
Later, we traveled to a hot springs area that had some petrified trees. A number of them were standing as they must have been when volcanic ash covered them. They had this one fenced off to keep souvenir hunters from carrying it away, piece by piece.
And after that, we toured a tremendous thermal area with all sorts of bubbling springs and roaring formations screaming thunder and steam.