Thousands of years before Euro-Americans “discovered” the bubbling mudpots and eruptive geysers of what is now Yellowstone National Park, early Americans were spending part of their summer camping in the Yellowstone Lake area.
http://billingsgazette.com/news/state-and-regional/wyoming/article_780b0b8e-3e0f-11df-862d-001cc4c002e0.html