It was just us and the bison the day we went out to find Mound Spring. Out in a meadow are four mounds and each has a hot pool on it, Mound Spring, Steep Cone, Iron Pot, and Flat Cone. We saw three of the four, but hadn’t brought shoes to cross the river to see Flat Cone. The meadow was also still a bit swampy, since it was only July, so next time I’d go out there in August.
The oldest building in Yellowstone is in the runoff pool of Red Terrace Spring. It’s a short, easy hike to Red Terrace, and I’m surprised we only saw two other people the day we were out there. I’m not complaining. It was just us and the bison.