March 1, 2022 marks the 150th anniversary of the establishment of Yellowstone National Park. We're celebrating this anniversary with some Yellowstone facts: There are more than 10,000 hydrothermal features in Yellowstone. The four types of thermal features are geysers, hot springs, mud pots, and fumaroles. Yellowstone has the most active, diverse, and intact collections of combined geothermal features with over 10,000 hydrothermal sites and half the world's active geysers. 27 Native American Tri