This is the Grand Canyon of the Yellowstone. It's a lot like the Grand Canyon in Arizona except that it's smaller and has some nice waterfalls.
Another view of the Grand Canyon of the Yellowstone. Here you can see a waterfall. Most of the waterfalls in Yellowstone really aren't very impressive if you're used to Yosemite, but the flow in the Yellowstone river was heavy enough that even though the falls weren't very tall they were very impressive up close.
Yellowstone Lake. Every time we got near the lake it looked totally different because either a storm was coming or leaving or it was in the middle of a thunderstorm or sunset or moonrise or. . .
This is Crevice Lake. It's small but deep (100 feet). We camped nearby at campsite 1Y4. It was a nice campsite but it's actually the other side of a ridge from the lake. Luckily it's right next to the Yellowstone river so there's good water access.