Basic Park Information History and Culture 100 Years in Yellowstone – Then and Now Early Yellowstone visitors at Handkerchief Pool (1923) Early Yellowstone visitors at Handkerchief Pool (1923) Share this Facebook Icon Twitter Icon Email Icon Join Yellowstone National Park Create a personalized feed and bookmark your favorites. Join for free Already have an account? Sign In Join Yellowstone National Park Create a personalized feed and bookmark your favorites. Join for free Already have an account? Sign In Photo: National Park Service